Programs & Examples On #Detect

Detect is overbroad and should not be used. Tag with the specific sort of detection you mean: collision-detection, face-detection, feature-detection, browser-detection, etc, etc.

Getting the screen resolution using PHP

The only way is to use javascript, then get the javascript to post to it to your php(if you really need there res server side). This will however completly fall flat on its face, if they turn javascript off.

detect key press in python?

Use this code for find the which key pressed

from pynput import keyboard

def on_press(key):
    try:
        print('alphanumeric key {0} pressed'.format(
            key.char))
    except AttributeError:
        print('special key {0} pressed'.format(
            key))

def on_release(key):
    print('{0} released'.format(
        key))
    if key == keyboard.Key.esc:
        # Stop listener
        return False

# Collect events until released
with keyboard.Listener(
        on_press=on_press,
        on_release=on_release) as listener:
    listener.join()

Reference alias (calculated in SELECT) in WHERE clause

You can do this using cross apply

SELECT c.BalanceDue AS BalanceDue
FROM Invoices
cross apply (select (InvoiceTotal - PaymentTotal - CreditTotal) as BalanceDue) as c
WHERE  c.BalanceDue  > 0;

Java - No enclosing instance of type Foo is accessible

Thing is an inner class with an automatic connection to an instance of Hello. You get a compile error because there is no instance of Hello for it to attach to. You can fix it most easily by changing it to a static nested class which has no connection:

static class Thing

The connection to adb is down, and a severe error has occurred

Judging from what you've posted, and assuming it's not a typo, Eclipse is looking in C:\s\platform-tools...

If that's the case, then you should check Eclipse's Window/Preferences/Android option for the SDK Location. Maybe yours is set to "C:\s". You can't edit it to be a value such as that without causing an error, but maybe it's got corrupted somehow.

How can I remove an entry in global configuration with git config?

Open config file to edit :

git config --global --edit

Press Insert and remove the setting

and finally type :wq and Enter to save.

How to change port for jenkins window service when 8080 is being used

Check in Jenkins.xml and update like below

<arguments>-Xrs -Xmx256m -Dhudson.lifecycle=hudson.lifecycle.WindowsServiceLifecycle -jar "%BASE%\jenkins.war" --httpPort=8090</arguments>

Relative instead of Absolute paths in Excel VBA

Just to clarify what yalestar said, this will give you the relative path:

Workbooks.Open FileName:= ThisWorkbook.Path & "\TRICATEndurance Summary.html"

how to check the dtype of a column in python pandas

In pandas 0.20.2 you can do:

from pandas.api.types import is_string_dtype
from pandas.api.types import is_numeric_dtype

is_string_dtype(df['A'])
>>>> True

is_numeric_dtype(df['B'])
>>>> True

So your code becomes:

for y in agg.columns:
    if (is_string_dtype(agg[y])):
        treat_str(agg[y])
    elif (is_numeric_dtype(agg[y])):
        treat_numeric(agg[y])

How would you do a "not in" query with LINQ?

While Except is part of the answer, it's not the whole answer. By default, Except (like several of the LINQ operators) does a reference comparison on reference types. To compare by values in the objects, you'll have to

  • implement IEquatable<T> in your type, or
  • override Equals and GetHashCode in your type, or
  • pass in an instance of a type implementing IEqualityComparer<T> for your type

Setting an int to Infinity in C++

This is a message for me in the future:

Just use: (unsigned)!((int)0)

It creates the largest possible number in any machine by assigning all bits to 1s (ones) and then casts it to unsigned

Even better

#define INF (unsigned)!((int)0)

And then just use INF in your code

No module named serial

Download this file :- (https://pypi.python.org/packages/1f/3b/ee6f354bcb1e28a7cd735be98f39ecf80554948284b41e9f7965951befa6/pyserial-3.2.1.tar.gz#md5=7142a421c8b35d2dac6c47c254db023d):

cd /opt
sudo tar -xvf ~/Downloads/pyserial-3.2.1.tar.gz -C .
cd /opt/pyserial-3.2.1 
sudo python setup.py install 

Get the current script file name

This might help:

basename($_SERVER['PHP_SELF'])

it will work even if you are using include.

Where is the .NET Framework 4.5 directory?

.NET 4.5 is not a side-by-side version, it replaces the assemblies for 4.0. Much like .NET 3.0, 3.5 and 3.5SP1 replaced the assemblies for 2.0. And added some new ones. The CLR version is still 4.0.30319. You only care about the reference assemblies, they are in c:\program files\reference assemblies.

How do I install pip on macOS or OS X?

You can install it through Homebrew on OS X. Why would you install Python with Homebrew?

The version of Python that ships with OS X is great for learning but it’s not good for development. The version shipped with OS X may be out of date from the official current Python release, which is considered the stable production version. (source)

Homebrew is something of a package manager for OS X. Find more details on the Homebrew page. Once Homebrew is installed, run the following to install the latest Python, Pip & Setuptools:

brew install python

crop text too long inside div

_x000D_
_x000D_
   .cut_text {_x000D_
      white-space: nowrap; _x000D_
      width: 200px; _x000D_
      border: 1px solid #000000;_x000D_
      overflow: hidden;_x000D_
      text-overflow: ellipsis;_x000D_
    }
_x000D_
<div class="cut_text">_x000D_
_x000D_
very long text_x000D_
</div>
_x000D_
_x000D_
_x000D_

How to convert integer into date object python?

Here is what I believe answers the question (Python 3, with type hints):

from datetime import date


def int2date(argdate: int) -> date:
    """
    If you have date as an integer, use this method to obtain a datetime.date object.

    Parameters
    ----------
    argdate : int
      Date as a regular integer value (example: 20160618)

    Returns
    -------
    dateandtime.date
      A date object which corresponds to the given value `argdate`.
    """
    year = int(argdate / 10000)
    month = int((argdate % 10000) / 100)
    day = int(argdate % 100)

    return date(year, month, day)


print(int2date(20160618))

The code above produces the expected 2016-06-18.

Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema

A somewhat unlikely situation.

I have removed the yarn.lock file, which referenced an older version of webpack.

So check to see the differences in your yarn.lock file as a possiblity.

HTML/CSS font color vs span style

1st preference external style sheet.

<span class="myClass">test</span>

css

.myClass
{
color:red;
}

2nd preference inline style

<span style="color:red">test</span>

<font> as mentioned is deprecated.

React Native: Possible unhandled promise rejection

delete build folder projectfile\android\app\build and run project

PHP CURL Enable Linux

I used the previous installation instruction on Ubuntu 12.4, and the php-curl module is successfully installed, (php-curl used in installing WHMCS billing System):
sudo apt-get install php5-curl
sudo /etc/init.d/apache2 restart

By the way the below line is not added to /etc/php5/apache2/php.ini config file as it's already mentioned: extension=curl.so

In addition the CURL module figures in http://localhost/phpinfo.php
Best,

how to open a page in new tab on button click in asp.net?

Try This

<a href="#" target="_blank">Link</a>

How to build a Horizontal ListView with RecyclerView?

Recycler View in Horizontal Dynamic.

Recycler View Implementation

RecyclerView musicList = findViewById(R.id.MusicList);

// RecyclerView musiclist = findViewById(R.id.MusicList1);
// RecyclerView musicLIST = findViewById(R.id.MusicList2);
LinearLayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
musicList.setLayoutManager(layoutManager);

String[] names = {"RAP", "CH SHB", "Faheem", "Anum", "Shoaib", "Laiba", "Zoki", "Komal", "Sultan","Mansoob Gull"};
musicList.setAdapter(new ProgrammingAdapter(names));'

Adapter class for recycler view, in which there is is a view holder for holding view of that recycler

public class ProgrammingAdapter 
     extendsRecyclerView.Adapter<ProgrammingAdapter.programmingViewHolder> {

private String[] data;

public ProgrammingAdapter(String[] data)
{
    this.data = data;
}

@Override
public programmingViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    LayoutInflater inflater = LayoutInflater.from(parent.getContext());
    View view = inflater.inflate(R.layout.list_item_layout, parent, false);

    return new programmingViewHolder(view);
}

@Override
public void onBindViewHolder(@NonNull programmingViewHolder holder, int position) {
    String title = data[position];
    holder.textV.setText(title);
}

@Override
public int getItemCount() {
    return data.length;
}

public class programmingViewHolder extends RecyclerView.ViewHolder{
    ImageView img;
    TextView textV;
    public programmingViewHolder(View itemView) {
        super(itemView);
        img =  itemView.findViewById(R.id.img);
        textV =  itemView.findViewById(R.id.textt);
    }
}

Postgres and Indexes on Foreign Keys and Primary Keys

Yes - for primary keys, no - for foreign keys (more in the docs).

\d <table_name>

in "psql" shows a description of a table including all its indexes.

List Highest Correlation Pairs from a Large Correlation Matrix in Pandas?

You can use DataFrame.values to get an numpy array of the data and then use NumPy functions such as argsort() to get the most correlated pairs.

But if you want to do this in pandas, you can unstack and sort the DataFrame:

import pandas as pd
import numpy as np

shape = (50, 4460)

data = np.random.normal(size=shape)

data[:, 1000] += data[:, 2000]

df = pd.DataFrame(data)

c = df.corr().abs()

s = c.unstack()
so = s.sort_values(kind="quicksort")

print so[-4470:-4460]

Here is the output:

2192  1522    0.636198
1522  2192    0.636198
3677  2027    0.641817
2027  3677    0.641817
242   130     0.646760
130   242     0.646760
1171  2733    0.670048
2733  1171    0.670048
1000  2000    0.742340
2000  1000    0.742340
dtype: float64

Xcode 6 iPhone Simulator Application Support location

Use Finder-->go to folder and enter given basepath to reach application folders

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;

NSLog(@"%@",basePath);

Setting focus to a textbox control

Quite simple :

For the tab control, you need to handle the _SelectedIndexChanged event:

Private Sub TabControl1_SelectedIndexChanged(sender As Object, e As System.EventArgs) _
  Handles TabControl1.SelectedIndexChanged

If TabControl1.SelectedTab.Name = "TabPage1" Then
    TextBox2.Focus()
End If
If TabControl1.SelectedTab.Name = "TabPage2" Then
    TextBox4.Focus()
End If

WAMP shows error 'MSVCR100.dll' is missing when install

For me problem did not resolve even after installing VC++ re-distributions. I had to manually download MSVCR110.dll file from https://www.dll-files.com/msvcr110.dll.html and placed it in c:/ > windows > system32 and it worked correctly.

get UTC time in PHP

Below find the PHP code to get current UTC(Coordinated Universal Time) time

_x000D_
_x000D_
<?php_x000D_
// Prints the day_x000D_
echo gmdate("l") . "<br>";_x000D_
_x000D_
// Prints the day, date, month, year, time, AM or PM_x000D_
echo gmdate("l jS \of F Y h:i:s A");_x000D_
?>
_x000D_
_x000D_
_x000D_

Remove duplicated rows using dplyr

Most of the time, the best solution is using distinct() from dplyr, as has already been suggested.

However, here's another approach that uses the slice() function from dplyr.

# Generate fake data for the example
  library(dplyr)
  set.seed(123)
  df <- data.frame(
    x = sample(0:1, 10, replace = T),
    y = sample(0:1, 10, replace = T),
    z = 1:10
  )

# In each group of rows formed by combinations of x and y
# retain only the first row

    df %>%
      group_by(x, y) %>%
      slice(1)

Difference from using the distinct() function

The advantage of this solution is that it makes it explicit which rows are retained from the original dataframe, and it can pair nicely with the arrange() function.

Let's say you had customer sales data and you wanted to retain one record per customer, and you want that record to be the one from their latest purchase. Then you could write:

customer_purchase_data %>%
   arrange(desc(Purchase_Date)) %>%
   group_by(Customer_ID) %>%
   slice(1)

Is there a "not equal" operator in Python?

There's the != (not equal) operator that returns True when two values differ, though be careful with the types because "1" != 1. This will always return True and "1" == 1 will always return False, since the types differ. Python is dynamically, but strongly typed, and other statically typed languages would complain about comparing different types.

There's also the else clause:

# This will always print either "hi" or "no hi" unless something unforeseen happens.
if hi == "hi":     # The variable hi is being compared to the string "hi", strings are immutable in Python, so you could use the 'is' operator.
    print "hi"     # If indeed it is the string "hi" then print "hi"
else:              # hi and "hi" are not the same
    print "no hi"

The is operator is the object identity operator used to check if two objects in fact are the same:

a = [1, 2]
b = [1, 2]
print a == b # This will print True since they have the same values
print a is b # This will print False since they are different objects.

How to enable local network users to access my WAMP sites?

I have some experiences in Wamp 3.0 and Apache 2.4 .

After all works do this steps:

1- Disable nod32.

2- Add this line to <VirtualHost *:80> block in httpd-vhosts.conf file:

Require ip 192.168.100 #client ip, allow 192.168.100.### ip's access

How can I get the assembly file version

There are three versions: assembly, file, and product. They are used by different features and take on different default values if you don't explicit specify them.

string assemblyVersion = Assembly.GetExecutingAssembly().GetName().Version.ToString(); 
string assemblyVersion = Assembly.LoadFile("your assembly file").GetName().Version.ToString(); 
string fileVersion = FileVersionInfo.GetVersionInfo(Assembly.GetExecutingAssembly().Location).FileVersion; 
string productVersion = FileVersionInfo.GetVersionInfo(Assembly.GetExecutingAssembly().Location).ProductVersion;

Checking if a field contains a string

ideal answer its use index i option for case-insensitive

db.users.findOne({"username" : new RegExp(search_value, 'i') });

how to convert `content://media/external/images/media/Y` to `file:///storage/sdcard0/Pictures/X.jpg` in android?

If you just want the bitmap, This too works

InputStream inputStream = mContext.getContentResolver().openInputStream(uri);
Bitmap bmp = BitmapFactory.decodeStream(inputStream);
if( inputStream != null ) inputStream.close();

sample uri : content://media/external/images/media/12345

What's the difference between Cache-Control: max-age=0 and no-cache?

I'm hardly a caching expert, but Mark Nottingham is. Here are his caching docs. He also has excellent links in the References section.

Based on my reading of those docs, it looks like max-age=0 could allow the cache to send a cached response to requests that came in at the "same time" where "same time" means close enough together they look simultaneous to the cache, but no-cache would not.

How to get the values of a ConfigurationSection of type NameValueSectionHandler

Here's a good post that shows how to do it.

If you want to read the values from a file other than the app.config, you need to load it into the ConfigurationManager.

Try this method: ConfigurationManager.OpenMappedExeConfiguration()

There's an example of how to use it in the MSDN article.

How to ignore PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException?

I got the same error while executing the below spring-boot + RestAssured simple test.

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import static com.jayway.restassured.RestAssured.when;
import static org.apache.http.HttpStatus.SC_OK;

@RunWith(SpringJUnit4ClassRunner.class)
public class GeneratorTest {

@Test
public void generatorEndPoint() {
    when().get("https://bal-bla-bla-bla.com/generators")
            .then().statusCode(SC_OK);
    }
}

The simple fix in my case is to add 'useRelaxedHTTPSValidations()'

RestAssured.useRelaxedHTTPSValidation();

Then the test looks like

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import static com.jayway.restassured.RestAssured.when;
import static org.apache.http.HttpStatus.SC_OK;

@RunWith(SpringJUnit4ClassRunner.class)
public class GeneratorTest {

@Before
public void setUp() {
   RestAssured.useRelaxedHTTPSValidation();
}


@Test
public void generatorEndPoint() {
    when().get("https://bal-bla-bla-bla.com/generators")
            .then().statusCode(SC_OK);
    }
}

MySQL Where DateTime is greater than today

Remove the date() part

SELECT name, datum 
FROM tasks 
WHERE datum >= NOW()

and if you use a specific date, don't forget the quotes around it and use the proper format with :

SELECT name, datum 
FROM tasks 
WHERE datum >= '2014-05-18 15:00:00'

How to format code in Xcode?

I would suggest taking a look JetBrains AppCode IDE. It has a Reformat Code command. I have come from a C# background and used Visual Studio with Jetbrains Resharper plugin, so learning AppCode has been a pleasure because many of the features in Resharper also exist in AppCode!

Theres too many features to list here but could well be worth checking out

Get generic type of class at runtime

I dont think you can, Java uses type erasure when compiling so your code is compatible with applications and libraries that were created pre-generics.

From the Oracle Docs:

Type Erasure

Generics were introduced to the Java language to provide tighter type checks at compile time and to support generic programming. To implement generics, the Java compiler applies type erasure to:

Replace all type parameters in generic types with their bounds or Object if the type parameters are unbounded. The produced bytecode, therefore, contains only ordinary classes, interfaces, and methods. Insert type casts if necessary to preserve type safety. Generate bridge methods to preserve polymorphism in extended generic types. Type erasure ensures that no new classes are created for parameterized types; consequently, generics incur no runtime overhead.

http://docs.oracle.com/javase/tutorial/java/generics/erasure.html

How to URL encode in Python 3?

You’re looking for urllib.parse.urlencode

import urllib.parse

params = {'username': 'administrator', 'password': 'xyz'}
encoded = urllib.parse.urlencode(params)
# Returns: 'username=administrator&password=xyz'

How to import a bak file into SQL Server Express

Restoring a Database from Backup

sql-server-->connect to instance-->Databases-->right-click on databases-->Restore
            DataBase..-->Device-->Add-->choose the path_filename(.bak)-->click OK

What is the difference between static_cast<> and C style casting?

In short:

  1. static_cast<>() gives you a compile time checking ability, C-Style cast doesn't.
  2. static_cast<>() is more readable and can be spotted easily anywhere inside a C++ source code, C_Style cast is'nt.
  3. Intentions are conveyed much better using C++ casts.

More Explanation:

The static cast performs conversions between compatible types. It is similar to the C-style cast, but is more restrictive. For example, the C-style cast would allow an integer pointer to point to a char.

char c = 10;       // 1 byte
int *p = (int*)&c; // 4 bytes

Since this results in a 4-byte pointer ( a pointer to 4-byte datatype) pointing to 1 byte of allocated memory, writing to this pointer will either cause a run-time error or will overwrite some adjacent memory.

*p = 5; // run-time error: stack corruption

In contrast to the C-style cast, the static cast will allow the compiler to check that the pointer and pointee data types are compatible, which allows the programmer to catch this incorrect pointer assignment during compilation.

int *q = static_cast<int*>(&c); // compile-time error

You can also check this page on more explanation on C++ casts : Click Here

Viewing root access files/folders of android on windows

I was looking long and hard for a solution to this problem and the best I found was a root FTP server on the phone that you connect to on Windows with an FTP client like FileZilla, on the same WiFi network of course.

The root FTP server app I ended up using is FTP Droid. I tried a lot of other FTP apps with bigger download numbers but none of them worked for me for whatever reason. So install this app and set a user with home as / or wherever you want.

Then make note of the phone IP and connect with FileZilla and you should have access to the root of the phone. The biggest benefit I found is I can download entire folders and FTP will just queue it up and take care of it. So I downloaded all of my /data/data/ folder when I was looking for an app and could search on my PC. Very handy.

React component initialize state from props

You could use the short form like below if you want to add all props to state and retain the same names.

constructor(props) {
    super(props);
    this.state = {
       ...props
    }
    //...
}

What is the preferred Bash shebang?

/bin/sh is usually a link to the system's default shell, which is often bash but on, e.g., Debian systems is the lighter weight dash. Either way, the original Bourne shell is sh, so if your script uses some bash (2nd generation, "Bourne Again sh") specific features ([[ ]] tests, arrays, various sugary things, etc.), then you should be more specific and use the later. This way, on systems where bash is not installed, your script won't run. I understand there may be an exciting trilogy of films about this evolution...but that could be hearsay.

Also note that when evoked as sh, bash to some extent behaves as POSIX standard sh (see also the GNU docs about this).

What is "String args[]"? parameter in main method Java

Explanation in simple layman's language.

The main method expects us to provide some arguments when we direct our JVM to the class name. That means, suppose your file name is Try.java, now to execute this in command prompt you write "javac Try.java" to compile followed by "java Try" to execute. Now suppose instead of writing simply "java Try" you write "java Try 1". Here you have passed an argument "1". This will be taken by your main method even if you don't use it in your code.

If you want to check whether your main method has actually taken the argument "1" or not. Simply, inside your main method type the following:

for(int i = 0; i < args.length; i++) {
        System.out.println("Argument is: "+args[i]);
    }

Node.js quick file server (static files over HTTP)

Install express using npm: https://expressjs.com/en/starter/installing.html

Create a file named server.js at the same level of your index.html with this content:

var express = require('express');
var server = express();
server.use('/', express.static(__dirname + '/'));
server.listen(8080);

If you wish to put it in a different location, set the path on the third line:

server.use('/', express.static(__dirname + '/public'));

CD to the folder containing your file and run node from the console with this command:

node server.js

Browse to localhost:8080

Java - What does "\n" mean?

\n

That means a new line is printed.

As a side note there is no need to write that extra line . There is an built in inbuilt function there.

 println()  //prints the content in new line

Learn more from docs

How to send 100,000 emails weekly?

Short answer: While it's technically possible to send 100k e-mails each week yourself, the simplest, easiest and cheapest solution is to outsource this to one of the companies that specialize in it (I did say "cheapest": there's no limit to the amount of development time (and therefore money) that you can sink into this when trying to DIY).

Long answer: If you decide that you absolutely want to do this yourself, prepare for a world of hurt (after all, this is e-mail/e-fail we're talking about). You'll need:

  • e-mail content that is not spam (otherwise you'll run into additional major roadblocks on every step, even legal repercussions)
  • in addition, your content should be easy to distinguish from spam - that may be a bit hard to do in some cases (I heard that a certain pharmaceutical company had to all but abandon e-mail, as their brand names are quite common in spams)
  • a configurable SMTP server of your own, one which won't buckle when you dump 100k e-mails onto it (your ISP's upstream server won't be sufficient here and you'll make the ISP violently unhappy; we used two dedicated boxes)
  • some mail wrapper (e.g. PhpMailer if PHP's your poison of choice; using PHP's mail() is horrible enough by itself)
  • your own sender function to run in a loop, create the mails and pass them to the wrapper (note that you may run into PHP's memory limits if your app has a memory leak; you may need to recycle the sending process periodically, or even better, decouple the "creating e-mails" and "sending e-mails" altogether)

Surprisingly, that was the easy part. The hard part is actually sending it:

  • some servers will ban you when you send too many mails close together, so you need to shuffle and watch your queue (e.g. send one mail to [email protected], then three to other domains, only then another to [email protected])
  • you need to have correct PTR, SPF, DKIM records
  • handling remote server timeouts, misconfigured DNS records and other network pleasantries
  • handling invalid e-mails (and no, regex is the wrong tool for that)
  • handling unsubscriptions (many legitimate newsletters have been reclassified as spam due to many frustrated users who couldn't unsubscribe in one step and instead chose to "mark as spam" - the spam filters do learn, esp. with large e-mail providers)
  • handling bounces and rejects ("no such mailbox [email protected]","mailbox [email protected] full")
  • handling blacklisting and removal from blacklists (Sure, you're not sending spam. Some recipients won't be so sure - with such large list, it will happen sometimes, no matter what precautions you take. Some people (e.g. your not-so-scrupulous competitors) might even go as far to falsely report your mailings as spam - it does happen. On average, it takes weeks to get yourself removed from a blacklist.)

And to top it off, you'll have to manage the legal part of it (various federal, state, and local laws; and even different tangles of laws once you send outside the U.S. (note: you have no way of finding if [email protected] lives in Southwest Elbonia, the country with world's most draconian antispam laws)).

I'm pretty sure I missed a few heads of this hydra - are you still sure you want to do this yourself? If so, there'll be another wave, this time merely the annoying problems inherent in sending an e-mail. (You see, SMTP is a store-and-forward protocol, which means that your e-mail will be shuffled across many SMTP servers around the Internet, in the hope that the next one is a bit closer to the final recipient. Basically, the e-mail is sent to an SMTP server, which puts it into its forward queue; when time comes, it will forward it further to a different SMTP server, until it reaches the SMTP server for the given domain. This forward could happen immediately, or in a few minutes, or hours, or days, or never.) Thus, you'll see the following issues - most of which could happen en route as well as at the destination:

  • the remote SMTP servers don't want to talk to your SMTP server
  • your mails are getting marked as spam (<blink> is not your friend here, nor is <font color=...>)
  • your mails are delivered days, even weeks late (contrary to popular opinion, SMTP is designed to make a best effort to deliver the message sometime in the future - not to deliver it now)
  • your mails are not delivered at all (already sent from e-mail server on hop #4, not sent yet from server on hop #5, the server that currently holds the message crashes, data is lost)
  • your mails are mangled by some braindead server en route (this one is somewhat solvable with base64 encoding, but then the size goes up and the e-mail looks more suspicious)
  • your mails are delivered and the recipients seem not to want them ("I'm sure I didn't sign up for this, I remember exactly what I did a year ago" (of course you do, sir))
  • users with various versions of Microsoft Outlook and its special handling of Internet mail
  • wizard's apprentice mode (a self-reinforcing positive feedback loop - in other words, automated e-mails as replies to automated e-mails as replies to...; you really don't want to be the one to set this off, as you'd anger half the internet at yourself)

and it'll be your job to troubleshoot and solve this (hint: you can't, mostly). The people who run a legit mass-mailing businesses know that in the end you can't solve it, and that they can't solve it either - and they have the reasons well researched, documented and outlined (maybe even as a Powerpoint presentation - complete with sounds and cool transitions - that your bosses can understand), as they've had to explain this a million times before. Plus, for the problems that are actually solvable, they know very well how to solve them.

If, after all this, you are not discouraged and still want to do this, go right ahead: it's even possible that you'll find a better way to do this. Just know that the road ahead won't be easy - sending e-mail is trivial, getting it delivered is hard.

How do I remove a specific element from a JSONArray?

You can use reflection

A Chinese website provides a relevant solution: http://blog.csdn.net/peihang1354092549/article/details/41957369
If you don't understand Chinese, please try to read it with the translation software.

He provides this code for the old version:

public void JSONArray_remove(int index, JSONArray JSONArrayObject) throws Exception{
    if(index < 0)
        return;
    Field valuesField=JSONArray.class.getDeclaredField("values");
    valuesField.setAccessible(true);
    List<Object> values=(List<Object>)valuesField.get(JSONArrayObject);
    if(index >= values.size())
        return;
    values.remove(index);
}

Difference between Inheritance and Composition

Are Composition and Inheritance the same?

They are not same.

Composition : It enables a group of objects have to be treated in the same way as a single instance of an object. The intent of a composite is to "compose" objects into tree structures to represent part-whole hierarchies

Inheritance: A class inherits fields and methods from all its superclasses, whether direct or indirect. A subclass can override methods that it inherits, or it can hide fields or methods that it inherits.

If I want to implement the composition pattern, how can I do that in Java?

Wikipedia article is good enough to implement composite pattern in java.

enter image description here

Key Participants:

Component:

  1. Is the abstraction for all components, including composite ones
  2. Declares the interface for objects in the composition

Leaf:

  1. Represents leaf objects in the composition
  2. Implements all Component methods

Composite:

  1. Represents a composite Component (component having children)
  2. Implements methods to manipulate children
  3. Implements all Component methods, generally by delegating them to its children

Code example to understand Composite pattern:

import java.util.List;
import java.util.ArrayList;

interface Part{
    public double getPrice();
    public String getName();
}
class Engine implements Part{
    String name;
    double price;
    public Engine(String name,double price){
        this.name = name;
        this.price = price;
    }
    public double getPrice(){
        return price;
    }
    public String getName(){
        return name;
    }
}
class Trunk implements Part{
    String name;
    double price;
    public Trunk(String name,double price){
        this.name = name;
        this.price = price;
    }
    public double getPrice(){
        return price;
    }
    public String getName(){
        return name;
    }
}
class Body implements Part{
    String name;
    double price;
    public Body(String name,double price){
        this.name = name;
        this.price = price;
    }
    public double getPrice(){
        return price;
    }
    public String getName(){
        return name;
    }
}
class Car implements Part{
    List<Part> parts;
    String name;

    public Car(String name){
        this.name = name;
        parts = new ArrayList<Part>();
    }
    public void addPart(Part part){
        parts.add(part);
    }
    public String getName(){
        return name;
    }
    public String getPartNames(){
        StringBuilder sb = new StringBuilder();
        for ( Part part: parts){
            sb.append(part.getName()).append(" ");
        }
        return sb.toString();
    }
    public double getPrice(){
        double price = 0;
        for ( Part part: parts){
            price += part.getPrice();
        }
        return price;
    }   
}

public class CompositeDemo{
    public static void main(String args[]){
        Part engine = new Engine("DiselEngine",15000);
        Part trunk = new Trunk("Trunk",10000);
        Part body = new Body("Body",12000);

        Car car = new Car("Innova");
        car.addPart(engine);
        car.addPart(trunk);
        car.addPart(body);

        double price = car.getPrice();

        System.out.println("Car name:"+car.getName());
        System.out.println("Car parts:"+car.getPartNames());
        System.out.println("Car price:"+car.getPrice());
    }

}

output:

Car name:Innova
Car parts:DiselEngine Trunk Body
Car price:37000.0

Explanation:

  1. Part is a leaf
  2. Car contains many Parts
  3. Different Parts of the car have been added to Car
  4. The price of Car = sum of ( Price of each Part )

Refer to below question for Pros and Cons of Composition and Inheritance.

Prefer composition over inheritance?

Excluding files/directories from Gulp task

Gulp uses micromatch under the hood for matching globs, so if you want to exclude any of the .min.js files, you can achieve the same by using an extended globbing feature like this:

src("'js/**/!(*.min).js")

Basically what it says is: grab everything at any level inside of js that doesn't end with *.min.js

How can I format my grep output to show line numbers at the end of the line, and also the hit count?

grep find the lines and output the line numbers, but does not let you "program" other things. If you want to include arbitrary text and do other "programming", you can use awk,

$ awk '/null/{c++;print $0," - Line number: "NR}END{print "Total null count: "c}' file
example two null,  - Line number: 2
example four null,  - Line number: 4
Total null count: 2

Or only using the shell(bash/ksh)

c=0
while read -r line
do
  case "$line" in
   *null* )  (
    ((c++))
    echo "$line - Line number $c"
    ;;
  esac
done < "file"
echo "total count: $c"

How to change value of a request parameter in laravel

Try to:

$requestData = $request->all();
$requestData['img'] = $img;

Another way to do it:

$request->merge(['img' => $img]);

Thanks to @JoelHinz for this.

If you want to add or overwrite nested data:

$data['some']['thing'] = 'value';
$request->merge($data);

If you do not inject Request $request object, you can use the global request() helper or \Request:: facade instead of $request

android pick images from gallery

Here is a full example for request permission (if need), pick image from gallery, then convert image to bitmap or file

AndroidManifesh.xml

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

Activity

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        button_pick_image.setOnClickListener {
            pickImage()
        }
    }

    private fun pickImage() {
        if (ActivityCompat.checkSelfPermission(this, READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
            val intent = Intent(
                Intent.ACTION_PICK,
                MediaStore.Images.Media.INTERNAL_CONTENT_URI
            )
            intent.type = "image/*"
            intent.putExtra("crop", "true")
            intent.putExtra("scale", true)
            intent.putExtra("aspectX", 16)
            intent.putExtra("aspectY", 9)
            startActivityForResult(intent, PICK_IMAGE_REQUEST_CODE)
        } else {
            ActivityCompat.requestPermissions(
                this,
                arrayOf(Manifest.permission.READ_EXTERNAL_STORAGE),
                READ_EXTERNAL_STORAGE_REQUEST_CODE
            )
        }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if (requestCode == PICK_IMAGE_REQUEST_CODE) {
            if (resultCode != Activity.RESULT_OK) {
                return
            }
            val uri = data?.data
            if (uri != null) {
                val imageFile = uriToImageFile(uri)
                // todo do something with file
            }
            if (uri != null) {
                val imageBitmap = uriToBitmap(uri)
                // todo do something with bitmap
            }
        }
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        when (requestCode) {
            READ_EXTERNAL_STORAGE_REQUEST_CODE -> {
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    // pick image after request permission success
                    pickImage()
                }
            }
        }
    }

    private fun uriToImageFile(uri: Uri): File? {
        val filePathColumn = arrayOf(MediaStore.Images.Media.DATA)
        val cursor = contentResolver.query(uri, filePathColumn, null, null, null)
        if (cursor != null) {
            if (cursor.moveToFirst()) {
                val columnIndex = cursor.getColumnIndex(filePathColumn[0])
                val filePath = cursor.getString(columnIndex)
                cursor.close()
                return File(filePath)
            }
            cursor.close()
        }
        return null
    }

    private fun uriToBitmap(uri: Uri): Bitmap {
        return MediaStore.Images.Media.getBitmap(this.contentResolver, uri)
    }

    companion object {
        const val PICK_IMAGE_REQUEST_CODE = 1000
        const val READ_EXTERNAL_STORAGE_REQUEST_CODE = 1001
    }
}

Demo
https://github.com/PhanVanLinh/AndroidPickImage

Restoring database from .mdf and .ldf files of SQL Server 2008

this is what i did

first execute create database x. x is the name of your old database eg the name of the mdf.

Then open sql sever configration and stop the sql sever.

There after browse to the location of your new created database it should be under program file, in my case is

C:\Program Files\Microsoft SQL Server\MSSQL14.MSSQL\MSSQL\DATA

and repleace the new created mdf and Idf with the old files/database.

then simply restart the sql server and walla :)

ReactJS: "Uncaught SyntaxError: Unexpected token <"

Add type="text/babel" to the script that includes the .jsx file and add this: <script src="https://npmcdn.com/[email protected]/browser.min.js"></script>

Visual Studio popup: "the operation could not be completed"

While working on VB.Net projects in Visual Studio 2005, I have faced this issue many times. Usually, disabling the 'Enable the Visual Studio hosting process' option in the application's debug properties solves the issue for me. Usually, when the hosting process is enabled, calls to certain APIs can be affected.

To un-check this option, you need to follow the steps below:

  • Right click on your project in the Solution Explorer
  • Select properties
  • Under Debug tab, you would find a check box option for Enable the Visual Studio hosting process. Un-check this option.
  • Save your changes

Android - implementing startForeground for a service?

In my case It was totally different since I was not having activity to launch the service in Oreo.

Below are the steps which I used to resolve this foreground service issue -

public class SocketService extends Service {
    private String TAG = this.getClass().getSimpleName();

    @Override
    public void onCreate() {
        Log.d(TAG, "Inside onCreate() API");
        if (Build.VERSION.SDK_INT >= 26) {
            NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this);
            mBuilder.setSmallIcon(R.drawable.ic_launcher);
            mBuilder.setContentTitle("Notification Alert, Click Me!");
            mBuilder.setContentText("Hi, This is Android Notification Detail!");
            NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

            // notificationID allows you to update the notification later on.
            mNotificationManager.notify(100, mBuilder.build());
            startForeground(100, mBuilder.mNotification);
        }
        Toast.makeText(getApplicationContext(), "inside onCreate()", Toast.LENGTH_LONG).show();
    }


    @Override
    public int onStartCommand(Intent resultIntent, int resultCode, int startId) {
        Log.d(TAG, "inside onStartCommand() API");

        return startId;
    }


    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.d(TAG, "inside onDestroy() API");

    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }
}

And after that to initiate this service I triggered below cmd -


adb -s " + serial_id + " shell am startforegroundservice -n com.test.socket.sample/.SocketService


So this helps me to start service without activity on Oreo devices :)

How to get client's IP address using JavaScript?

Use ipdata.co.

The API also provides geolocation data and has 10 global endpoints each able to handle >800M requests a day!

This answer uses a 'test' API Key that is very limited and only meant for testing a few calls. Signup for your own Free API Key and get up to 1500 requests daily for development.

_x000D_
_x000D_
$.get("https://api.ipdata.co?api-key=test", function (response) {_x000D_
    $("#response").html(response.ip);_x000D_
}, "jsonp");
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<pre id="response"></pre>
_x000D_
_x000D_
_x000D_

Multiple input in JOptionPane.showInputDialog

Yes. You know that you can put any Object into the Object parameter of most JOptionPane.showXXX methods, and often that Object happens to be a JPanel.

In your situation, perhaps you could use a JPanel that has several JTextFields in it:

import javax.swing.*;

public class JOptionPaneMultiInput {
   public static void main(String[] args) {
      JTextField xField = new JTextField(5);
      JTextField yField = new JTextField(5);

      JPanel myPanel = new JPanel();
      myPanel.add(new JLabel("x:"));
      myPanel.add(xField);
      myPanel.add(Box.createHorizontalStrut(15)); // a spacer
      myPanel.add(new JLabel("y:"));
      myPanel.add(yField);

      int result = JOptionPane.showConfirmDialog(null, myPanel, 
               "Please Enter X and Y Values", JOptionPane.OK_CANCEL_OPTION);
      if (result == JOptionPane.OK_OPTION) {
         System.out.println("x value: " + xField.getText());
         System.out.println("y value: " + yField.getText());
      }
   }
}

Creating a segue programmatically

You have to link your code to the UIStoryboard that you're using. Make sure you go into YourViewController in your UIStoryboard, click on the border around it, and then set its identifier field to a NSString that you call in your code.

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" 
                                                     bundle:nil];
YourViewController *yourViewController = 
 (YourViewController *)
  [storyboard instantiateViewControllerWithIdentifier:@"yourViewControllerID"];
[self.navigationController pushViewController:yourViewController animated:YES];

How to put a delay on AngularJS instant search?

Just for users redirected here:

As introduced in Angular 1.3 you can use ng-model-options attribute:

<input 
       id="searchText" 
       type="search" 
       placeholder="live search..." 
       ng-model="searchText"
       ng-model-options="{ debounce: 250 }"
/>

How to loop through files matching wildcard in batch file

Assuming you have two programs that process the two files, process_in.exe and process_out.exe:

for %%f in (*.in) do (
    echo %%~nf
    process_in "%%~nf.in"
    process_out "%%~nf.out"
)

%%~nf is a substitution modifier, that expands %f to a file name only. See other modifiers in https://technet.microsoft.com/en-us/library/bb490909.aspx (midway down the page) or just in the next answer.

Java logical operator short-circuiting

Logical OR :- returns true if at least one of the operands evaluate to true. Both operands are evaluated before apply the OR operator.

Short Circuit OR :- if left hand side operand returns true, it returns true without evaluating the right hand side operand.

How to return a boolean method in java?

You can also do this, for readability's sake

boolean passwordVerified=(pword.equals(pwdRetypePwd.getText());

if(!passwordVerified ){
    txtaError.setEditable(true);
    txtaError.setText("*Password didn't match!");
    txtaError.setForeground(Color.red);
    txtaError.setEditable(false);
}else{
    addNewUser();
}
return passwordVerified;

c# search string in txt file

If you whant only one first string, you can use simple for-loop.

var lines = File.ReadAllLines(pathToTextFile);

var firstFound = false;
for(int index = 0; index < lines.Count; index++)
{
   if(!firstFound && lines[index].Contains("CustomerEN"))
   {
      firstFound = true;
   }
   if(firstFound && lines[index].Contains("CustomerCh"))
   {
      //do, what you want, and exit the loop
      // return lines[index];
   }
}

Form submit with AJAX passing form data to PHP without page refresh

<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script type="text/javascript" >
  $(function () {
    $(".submit").click(function (event) {
      var time = $("#time").val();
      var date = $("#date").val();
      var dataString = 'time=' + time + '&date=' + date;
      console.log(dataString);
      if (time == '' || date == '')
      {
        $('.success').fadeOut(200).hide();
        $('.error').fadeOut(200).show();
      } else
      {
        $.ajax({
          type: "POST",
          url: "post.php",
          data: dataString,
          success: function (data) {
            $('.success').fadeIn(200).show();
            $('.error').fadeOut(200).hide();
            $("#data").html(data);
          }
        });
      }
      event.preventDefault();
    });
  });
</script>
<form action="post.php" method="POST">
  <input id="time" value=""><br>
  <input id="date" value=""><br>
  <input name="submit" type="button" value="Submit" class="submit">
</form>
<div id="data"></div>
<span class="error" style="display:none"> Please Enter Valid Data</span>
<span class="success" style="display:none"> Form Submitted Success</span>

<?php

print_r($_POST);
if ($_POST['date']) {
  $date = $_POST['date'];
  $time = $_POST['time'];
  echo '<h1>' . $date . '---' . $time . '</h1>';
}
else {

}
?>

Why do I have to run "composer dump-autoload" command to make migrations work in laravel?

You should run:

composer dump-autoload

and if does not work you should:

re-install composer

How to use apply a custom drawable to RadioButton?

In programmatically, add the background image

minSdkVersion 16

RadioGroup rg = new RadioGroup(this);
RadioButton radioButton = new RadioButton(this);
radioButton.setBackground(R.drawable.account_background);
rg.addView(radioButton);

How do implement a breadth first traversal?

Breadth first search

Queue<TreeNode> queue = new LinkedList<BinaryTree.TreeNode>() ;
public void breadth(TreeNode root) {
    if (root == null)
        return;
    queue.clear();
    queue.add(root);
    while(!queue.isEmpty()){
        TreeNode node = queue.remove();
        System.out.print(node.element + " ");
        if(node.left != null) queue.add(node.left);
        if(node.right != null) queue.add(node.right);
    }

}

Opening a remote machine's Windows C drive

If it's not the Home edition of XP, you can use \\servername\c$

Mark Brackett's comment:

Note that you need to be an Administrator on the local machine, as the share permissions are locked down

Java Currency Number format

NumberFormat currency = NumberFormat.getCurrencyInstance();
String myCurrency = currency.format(123.5);
System.out.println(myCurrency);

output:

$123.50

If you want to change the currency,

NumberFormat currency = NumberFormat.getCurrencyInstance(Locale.CHINA);
String myCurrency = currency.format(123.5);
System.out.println(myCurrency);

output:

?123.50

Regular Expressions- Match Anything

If you're using JavaScript, ES2018 added the /s (dotAll) flag. With the /s flag, the dot . will match any character, including a newline.

_x000D_
_x000D_
console.log("line_1\nline_2".match(/.+/s))
_x000D_
_x000D_
_x000D_

Note: It's not supported by all browsers yet.

Remove blank lines with grep

Use:

$ dos2unix file
$ grep -v "^$" file

Or just simply awk:

awk 'NF' file

If you don't have dos2unix, then you can use tools like tr:

tr -d '\r' < "$file" > t ; mv t "$file"

How do pointer-to-pointer's work in C? (and when might you use them?)

A pointer to pointer is, well, a pointer to pointer.

A meaningfull example of someType** is a bidimensional array: you have one array, filled with pointers to other arrays, so when you write

dpointer[5][6]

you access at the array that contains pointers to other arrays in his 5th position, get the pointer (let fpointer his name) and then access the 6th element of the array referenced to that array (so, fpointer[6]).

How to deal with persistent storage (e.g. databases) in Docker

It depends on your scenario (this isn't really suitable for a production environment), but here is one way:

Creating a MySQL Docker Container

This gist of it is to use a directory on your host for data persistence.

jQuery check if <input> exists and has a value

The input won't have a value if it doesn't exist. Try this...

if($('.input1').val())

What is Ruby's double-colon `::`?

module Amimal
      module Herbivorous
            EATER="plants" 
      end
end

Amimal::Herbivorous::EATER => "plants"

:: Is used to create a scope . In order to access Constant EATER from 2 modules we need to scope the modules to reach up to the constant

Python 3.1.1 string to hex

You've already got some good answers, but I thought you might be interested in a bit of the background too.

Firstly you're missing the quotes. It should be:

"hello".encode("hex")

Secondly this codec hasn't been ported to Python 3.1. See here. It seems that they haven't yet decided whether or not these codecs should be included in Python 3 or implemented in a different way.

If you look at the diff file attached to that bug you can see the proposed method of implementing it:

import binascii
output = binascii.b2a_hex(input)

Spring Boot Configure and Use Two DataSources

Refer the official documentation


Creating more than one data source works same as creating the first one. You might want to mark one of them as @Primary if you are using the default auto-configuration for JDBC or JPA (then that one will be picked up by any @Autowired injections).

@Bean
@Primary
@ConfigurationProperties(prefix="datasource.primary")
public DataSource primaryDataSource() {
    return DataSourceBuilder.create().build();
}

@Bean
@ConfigurationProperties(prefix="datasource.secondary")
public DataSource secondaryDataSource() {
    return DataSourceBuilder.create().build();
}

Getting a random value from a JavaScript array

The shortest version:

var myArray = ['January', 'February', 'March']; 
var rand = myArray[(Math.random() * myArray.length) | 0]

How to get value of checked item from CheckedListBox?

try:

  foreach (var item in chlCompanies.CheckedItems){
     item.Value //ID
     item.Text //CompanyName
  }

How to send data to COM PORT using JAVA?

The Java Communications API (also known as javax.comm) provides applications access to RS-232 hardware (serial ports): http://www.oracle.com/technetwork/java/index-jsp-141752.html

"import datetime" v.s. "from datetime import datetime"

Your trouble is that you have some code that is expecting datetime to be a reference to the datetime module and other code that is expecting datetime to be a reference to the datetime class. Obviously, it can't be both.

When you do:

from datetime import datetime
import datetime

You are first setting datetime to be a reference to the class, then immediately setting it to be a reference to the module. When you do it the other way around, it's the same thing, but it ends up being a reference to the class.

You need to rename one of these references. For example:

import datetime as dt
from datetime import datetime

Then you can change references in the form datetime.xxxx that refer to the module to dt.xxxx.

Or else just import datetime and change all references to use the module name. In other words, if something just says datetime(...) you need to change that reference to datetime.datetime.

Python has a fair bit of this kind of thing in its library, unfortunately. If they followed their own naming guidelines in PEP 8, the datetime class would be named Datetime and there'd be no problem using both datetime to mean the module and Datetime to mean the class.

Long vs Integer, long vs int, what to use and when?

Integer is a signed 32 bit integer type

  • Denoted as Int
  • Size = 32 bits (4byte)
  • Can hold integers of range -2,147,483,648 to 2,147,483,647
  • default value is 0


Long is a signed 64 bit integer type

  • Denoted as Long
  • Size = 64 bits (8byte)
  • Can hold integers of range -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
  • default value is 0L


If your usage of a variable falls in the 32 bit range, use Int, else use long. Usually long is used for scientific computations and stuff like that need much accuracy. (eg. value of pi).

An example of choosing one over the other is YouTube's case. They first defined video view counter as an int which was overflowed when more than 2,147,483,647 views where received to a popular video. Since an Int counter cannot store any value more than than its range, YouTube changed the counter to a 64 bit variable and now can count up to 9,223,372,036,854,775,807 views. Understand your data and choose the type which fits as 64 bit variable will take double the memory than a 32 bit variable.

Bootstrap 3 - How to load content in modal body via AJAX?

This is actually super simple with just a little bit of added javascript. The link's href is used as the ajax content source. Note that for Bootstrap 3.* we set data-remote="false" to disable the deprecated Bootstrap load function.

JavaScript:

// Fill modal with content from link href
$("#myModal").on("show.bs.modal", function(e) {
    var link = $(e.relatedTarget);
    $(this).find(".modal-body").load(link.attr("href"));
});

Html (based on the official example):

<!-- Link trigger modal -->
<a href="remoteContent.html" data-remote="false" data-toggle="modal" data-target="#myModal" class="btn btn-default">
    Launch Modal
</a>

<!-- Default bootstrap modal example -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        <h4 class="modal-title" id="myModalLabel">Modal title</h4>
      </div>
      <div class="modal-body">
        ...
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

Try it yourself: https://jsfiddle.net/ednon5d1/

How to close existing connections to a DB

You can use Cursor like that:

USE master
GO

DECLARE @SQL AS VARCHAR(255)
DECLARE @SPID AS SMALLINT
DECLARE @Database AS VARCHAR(500)
SET @Database = 'AdventureWorks2016CTP3'

DECLARE Murderer CURSOR FOR
SELECT spid FROM sys.sysprocesses WHERE DB_NAME(dbid) = @Database

OPEN Murderer

FETCH NEXT FROM Murderer INTO @SPID
WHILE @@FETCH_STATUS = 0

    BEGIN
    SET @SQL = 'Kill ' + CAST(@SPID AS VARCHAR(10)) + ';'
    EXEC (@SQL)
    PRINT  ' Process ' + CAST(@SPID AS VARCHAR(10)) +' has been killed'
    FETCH NEXT FROM Murderer INTO @SPID
    END 

CLOSE Murderer
DEALLOCATE Murderer

I wrote about that in my blog here: http://www.pigeonsql.com/single-post/2016/12/13/Kill-all-connections-on-DB-by-Cursor

This certificate has an invalid issuer Apple Push Services

I think I've figured this one out. I imported the new WWDR Certificate that expires in 2023, but I was still getting problems building and my developer certificates were still showing the invalid issuer error.

  • In keychain access, go to View -> Show Expired Certificates. Then in your login keychain highlight the expired WWDR Certificate and delete it.
  • I also had the same expired certificate in my System keychain, so I deleted it from there too (important).

After deleting the expired certificate from the login and System keychains, I was able to build for Distribution again.

How to mark-up phone numbers?

I use the normal <a href="tel:+123456">12 34 56</a> markup and make those links non-clickable for desktop users via pointer-events: none;

a[href^="tel:"] {
    text-decoration: none;
}
.no-touch a[href^="tel:"] {
    pointer-events: none;
    cursor: text;
}

for browsers that don't support pointer-events (IE < 11), the click can be prevented with JavaScript (example relies on Modernizr and jQuery):

if(!Modernizr.touch) {
    $(document).on('click', '[href^="tel:"]', function(e) {
        e.preventDefault();
        return false;
    });
}

Set cursor position on contentEditable <div>

I took Nico Burns's answer and made it using jQuery:

  • Generic: For every div contentEditable="true"
  • Shorter

You'll need jQuery 1.6 or higher:

savedRanges = new Object();
$('div[contenteditable="true"]').focus(function(){
    var s = window.getSelection();
    var t = $('div[contenteditable="true"]').index(this);
    if (typeof(savedRanges[t]) === "undefined"){
        savedRanges[t]= new Range();
    } else if(s.rangeCount > 0) {
        s.removeAllRanges();
        s.addRange(savedRanges[t]);
    }
}).bind("mouseup keyup",function(){
    var t = $('div[contenteditable="true"]').index(this);
    savedRanges[t] = window.getSelection().getRangeAt(0);
}).on("mousedown click",function(e){
    if(!$(this).is(":focus")){
        e.stopPropagation();
        e.preventDefault();
        $(this).focus();
    }
});

_x000D_
_x000D_
savedRanges = new Object();_x000D_
$('div[contenteditable="true"]').focus(function(){_x000D_
    var s = window.getSelection();_x000D_
    var t = $('div[contenteditable="true"]').index(this);_x000D_
    if (typeof(savedRanges[t]) === "undefined"){_x000D_
        savedRanges[t]= new Range();_x000D_
    } else if(s.rangeCount > 0) {_x000D_
        s.removeAllRanges();_x000D_
        s.addRange(savedRanges[t]);_x000D_
    }_x000D_
}).bind("mouseup keyup",function(){_x000D_
    var t = $('div[contenteditable="true"]').index(this);_x000D_
    savedRanges[t] = window.getSelection().getRangeAt(0);_x000D_
}).on("mousedown click",function(e){_x000D_
    if(!$(this).is(":focus")){_x000D_
        e.stopPropagation();_x000D_
        e.preventDefault();_x000D_
        $(this).focus();_x000D_
    }_x000D_
});
_x000D_
div[contenteditable] {_x000D_
    padding: 1em;_x000D_
    font-family: Arial;_x000D_
    outline: 1px solid rgba(0,0,0,0.5);_x000D_
}
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<div contentEditable="true"></div>_x000D_
<div contentEditable="true"></div>_x000D_
<div contentEditable="true"></div>
_x000D_
_x000D_
_x000D_

Android ACTION_IMAGE_CAPTURE Intent

to have the camera write to sdcard but keep in a new Album on the gallery app I use this :

 File imageDirectory = new File("/sdcard/signifio");
          String path = imageDirectory.toString().toLowerCase();
           String name = imageDirectory.getName().toLowerCase();


            ContentValues values = new ContentValues(); 
            values.put(Media.TITLE, "Image"); 
            values.put(Images.Media.BUCKET_ID, path.hashCode());
            values.put(Images.Media.BUCKET_DISPLAY_NAME,name);

            values.put(Images.Media.MIME_TYPE, "image/jpeg");
            values.put(Media.DESCRIPTION, "Image capture by camera");
           values.put("_data", "/sdcard/signifio/1111.jpg");
         uri = getContentResolver().insert( Media.EXTERNAL_CONTENT_URI , values);
            Intent i = new Intent("android.media.action.IMAGE_CAPTURE"); 

            i.putExtra(MediaStore.EXTRA_OUTPUT, uri);

            startActivityForResult(i, 0); 

Please note that you will need to generate a unique filename every time and replace teh 1111.jpg that I wrote. This was tested with nexus one. the uri is declared in the private class , so on activity result I am able to load the image from the uri to imageView for preview if needed.

How to make a DIV not wrap?

<div style="height:200px;width:200px;border:; white-space: nowrap;overflow-x: scroll;overflow-y: hidden;">
   <p>The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog.The quick brown fox jumps over the lazy dog.The quick brown fox jumps over the lazy dog.
   The quick brown fox jumps over the lazy dog.The quick brown fox jumps over the lazy dog.The quick brown fox jumps over the lazy dog.The quick brown fox jumps over the lazy dog.
   The quick brown fox jumps over the lazy dog.
   The quick brown fox jumps over the lazy dog.The quick brown fox jumps over the lazy dog.The quick brown fox jumps over the lazy dog.The quick brown fox jumps over the lazy dog.
   The quick brown fox jumps over the lazy dog.The quick brown fox jumps over the lazy dog.</p>
</div>

How can I change or remove HTML5 form validation default error messages?

This is work for me in Chrome

_x000D_
_x000D_
<input type="text" name="product_title" class="form-control" 
    required placeholder="Product Name" value="" pattern="([A-z0-9À-ž\s]){2,}"
    oninvalid="setCustomValidity('Please enter on Producut Name at least 2 characters long')" />
_x000D_
_x000D_
_x000D_

Is there a REAL performance difference between INT and VARCHAR primary keys?

The question is about MySQL so I say there is a significant difference. If it was about Oracle (which stores numbers as string - yes, I couldn't believe it at first) then not much difference.

Storage in the table is not the issue but updating and referring to the index is. Queries involving looking up a record based on its primary key are frequent - you want them to occur as fast as possible because they happen so often.

The thing is a CPU deals with 4 byte and 8 byte integers naturally, in silicon. It's REALLY fast for it to compare two integers - it happens in one or two clock cycles.

Now look at a string - it's made up of lots of characters (more than one byte per character these days). Comparing two strings for precedence can't be done in one or two cycles. Instead the strings' characters must be iterated until a difference is found. I'm sure there are tricks to make it faster in some databases but that's irrelevant here because an int comparison is done naturally and lightning fast in silicon by the CPU.

My general rule - every primary key should be an autoincrementing INT especially in OO apps using an ORM (Hibernate, Datanucleus, whatever) where there's lots of relationships between objects - they'll usually always be implemented as a simple FK and the ability for the DB to resolve those fast is important to your app' s responsiveness.

How to create an Array, ArrayList, Stack and Queue in Java?

Just a small correction to the first answer in this thread.

Even for Stack, you need to create new object with generics if you are using Stack from java util packages.

Right usage:
    Stack<Integer> s = new Stack<Integer>();
    Stack<String> s1 = new Stack<String>();

    s.push(7);
    s.push(50);

    s1.push("string");
    s1.push("stack");

if used otherwise, as mentioned in above post, which is:

    /*
    Stack myStack = new Stack();
    // add any type of elements (String, int, etc..)
    myStack.push("Hello");
    myStack.push(1);
    */

Although this code works fine, has unsafe or unchecked operations which results in error.

Checking for empty queryset in Django

I disagree with the predicate

if not orgs:

It should be

if not orgs.count():

I was having the same issue with a fairly large result set (~150k results). The operator is not overloaded in QuerySet, so the result is actually unpacked as a list before the check is made. In my case execution time went down by three orders.

Validate fields after user has left a field

By using ng-focus you can achieve your goal. you need to provide ng-focus in your input field. And while writing your ng-show derivatives you have to write a logic not equal too. Like the below code:

<input type="text" class="form-control" name="inputPhone" ng-model="demo.phoneNumber" required ng-focus> <div ng-show="demoForm.inputPhone.$dirty && demoForm.inputPhone.$invalid && !demoForm.inputPhone.$focused"></div>

How to show changed file name only with git log?

Now I use the following to get the list of changed files my current branch has, comparing it to master (the compare-to branch is easily changed):

git log --oneline --pretty="format:" --name-only master.. | awk 'NF' | sort -u

Before, I used to rely on this:

git log --name-status <branch>..<branch> | grep -E '^[A-Z]\b' | sort -k 2,2 -u

which outputs a list of files only and their state (added, modified, deleted):

A   foo/bar/xyz/foo.txt
M   foo/bor/bar.txt
...

The -k2,2 option for sort, makes it sort by file path instead of the type of change (A, M, D,).

How do I do string replace in JavaScript to convert ‘9.61’ to ‘9:61’?

I love jQuery's method chaining. Simply do...

    var value = $("#text").val().replace('.',':');

    //Or if you want to return the value:
    return $("#text").val().replace('.',':');

How do I remove blank elements from an array?

There are many ways to do this, one is reject

noEmptyCities = cities.reject { |c| c.empty? }

You can also use reject!, which will modify cities in place. It will either return cities as its return value if it rejected something, or nil if no rejections are made. That can be a gotcha if you're not careful (thanks to ninja08 for pointing this out in the comments).

How to select rows where column value IS NOT NULL using CodeIgniter's ActiveRecord?

The Active Record definitely has some quirks. When you pass an array to the $this->db->where() function it will generate an IS NULL. For example:

$this->db->where(array('archived' => NULL));

produces

WHERE `archived` IS NULL 

The quirk is that there is no equivalent for the negative IS NOT NULL. There is, however, a way to do it that produces the correct result and still escapes the statement:

$this->db->where('archived IS NOT NULL');

produces

WHERE `archived` IS NOT NULL

Android JSONObject - How can I loop through a flat JSON object to get each key and value

Use the keys() iterator to iterate over all the properties, and call get() for each.

Iterator<String> iter = json.keys();
while (iter.hasNext()) {
    String key = iter.next();
    try {
        Object value = json.get(key);
    } catch (JSONException e) {
        // Something went wrong!
    }
}

Printing 2D array in matrix format

I wrote extension method

public static string ToMatrixString<T>(this T[,] matrix, string delimiter = "\t")
{
    var s = new StringBuilder();

    for (var i = 0; i < matrix.GetLength(0); i++)
    {
        for (var j = 0; j < matrix.GetLength(1); j++)
        {
            s.Append(matrix[i, j]).Append(delimiter);
        }

        s.AppendLine();
    }

    return s.ToString();
}

To use just call the method

results.ToMatrixString();

Can I use VARCHAR as the PRIMARY KEY?

It is ok for sure. With just few hundred of entries, it will be fast.

You can add an unique id as as primary key (int autoincrement) ans set your coupon_code as unique. So if you need to do request in other tables it's better to use int than varchar

disable textbox using jquery?

HTML

<span id="radiobutt">
  <input type="radio" name="rad1" value="1" />
  <input type="radio" name="rad1" value="2" />
  <input type="radio" name="rad1" value="3" />
</span>
<div>
  <input type="text" id="textbox1" />
  <input type="checkbox" id="checkbox1" />
</div>

Javascript

  $("#radiobutt input[type=radio]").each(function(i){
    $(this).click(function () {
        if(i==2) { //3rd radiobutton
            $("#textbox1").attr("disabled", "disabled"); 
            $("#checkbox1").attr("disabled", "disabled"); 
        }
        else {
            $("#textbox1").removeAttr("disabled"); 
            $("#checkbox1").removeAttr("disabled"); 
        }
      });

  });

What is "pass-through authentication" in IIS 7?

Normally, IIS would use the process identity (the user account it is running the worker process as) to access protected resources like file system or network.

With passthrough authentication, IIS will attempt to use the actual identity of the user when accessing protected resources.

If the user is not authenticated, IIS will use the application pool identity instead. If pool identity is set to NetworkService or LocalSystem, the actual Windows account used is the computer account.

The IIS warning you see is not an error, it's just a warning. The actual check will be performed at execution time, and if it fails, it'll show up in the log.

Python base64 data decode

(I know this is old but I wanted to post this for people like me who stumble upon it in the future) I personally just use this python code to decode base64 strings:

print open("FILE-WITH-STRING", "rb").read().decode("base64")

So you can run it in a bash script like this:

python -c 'print open("FILE-WITH-STRING", "rb").read().decode("base64")' > outputfile
file -i outputfile

twneale has also pointed out an even simpler solution: base64 -d So you can use it like this:

cat "FILE WITH STRING" | base64 -d > OUTPUTFILE
#Or You Can Do This
echo "STRING" | base64 -d > OUTPUTFILE

That will save the decoded string to outputfile and then attempt to identify file-type using either the file tool or you can try TrID. The following command will decode the string into a file and then use TrID to automatically identify the file's type and add the extension.

echo "STRING" | base64 -d > OUTPUTFILE; trid -ce OUTPUTFILE

Using intents to pass data between activities

Main Activity

public class MainActivity extends Activity {

    EditText user, password;
    Button login;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        user = (EditText) findViewById(R.id.username_edit);
        password = (EditText) findViewById(R.id.edit_password);
        login = (Button) findViewById(R.id.btnSubmit);
        login.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,Second.class);

                String uservalue = user.getText().toString();
                String name_value = password.getText().toString();
                String password_value = password.getText().toString();

                intent.putExtra("username", uservalue);
                intent.putExtra("password", password_value);
                startActivity(intent);
            }
        });
    }
}

Second Activity in which you want to receive Data

public class Second extends Activity{

    EditText name, pass;
    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.second_activity);

        name = (EditText) findViewById(R.id.editText1);
        pass = (EditText) findViewById(R.id.editText2);

        String value = getIntent().getStringExtra("username");
        String pass_val = getIntent().getStringExtra("password");
        name.setText(value);
        pass.setText(pass_val);
    }
}

How to export a CSV to Excel using Powershell

This is a slight variation that worked better for me.

$csv = Join-Path $env:TEMP "input.csv"
$xls = Join-Path $env:TEMP "output.xlsx"

$xl = new-object -comobject excel.application
$xl.visible = $false
$Workbook = $xl.workbooks.open($CSV)
$Worksheets = $Workbooks.worksheets

$Workbook.SaveAs($XLS,1)
$Workbook.Saved = $True

$xl.Quit()

Ruby on Rails 3 Can't connect to local MySQL server through socket '/tmp/mysql.sock' on OSX

Your mysql server may not be running. Below explains how to start the server. This is an excerpt from the README file that comes with the mysql download.

After the installation, you can start up MySQL by running the following commands in a terminal window. You must have administrator privileges to perform this task.

If you have installed the Startup Item, use this command:

 shell> sudo /Library/StartupItems/MySQLCOM/MySQLCOM start
 (ENTER YOUR PASSWORD, IF NECESSARY)
 (PRESS CONTROL-D OR ENTER "EXIT" TO EXIT THE SHELL)

If you don't use the Startup Item, enter the following command sequence:

 shell> cd /usr/local/mysql
 shell> sudo ./bin/mysqld_safe
 (ENTER YOUR PASSWORD, IF NECESSARY)
 (PRESS CONTROL-Z)
 shell> bg
 (PRESS CONTROL-D OR ENTER "EXIT" TO EXIT THE SHELL)

how to count the total number of lines in a text file using python

Use:

num_lines = sum(1 for line in open('data.txt'))
print(num_lines)

That will work.

Changing variable names with Python for loops

Use a list.

groups = [0]*3
for i in xrange(3):
    groups[i] = self.getGroup(selected, header + i)

or more "Pythonically":

groups = [self.getGroup(selected, header + i) for i in xrange(3)]

For what it's worth, you could try to create variables the "wrong" way, i.e. by modifying the dictionary which holds their values:

l = locals()
for i in xrange(3):
    l['group' + str(i)] = self.getGroup(selected, header + i)

but that's really bad form, and possibly not even guaranteed to work.

How to set base url for rest in spring boot?

For those who use YAML configuration(application.yaml).

Note: this works only for Spring Boot 2.x.x

server:
  servlet:
    contextPath: /api

If you are still using Spring Boot 1.x

server:
  contextPath: /api

How to create dynamic href in react render function?

In addition to Felix's answer,

href={`/posts/${posts.id}`}

would work well too. This is nice because it's all in one string.

Java IOException "Too many open files"

Recently, I had a program batch processing files, I have certainly closed each file in the loop, but the error still there.

And later, I resolved this problem by garbage collect eagerly every hundreds of files:

int index;
while () {
    try {
        // do with outputStream...
    } finally {
        out.close();
    }
    if (index++ % 100 = 0)
        System.gc();
}

Compare a date string to datetime in SQL Server?

There are many formats for date in SQL which are being specified. Refer https://msdn.microsoft.com/en-in/library/ms187928.aspx

Converting and comparing varchar column with selected dates.

Syntax:

SELECT * FROM tablename where CONVERT(datetime,columnname,103) 
    between '2016-03-01' and '2016-03-03'
In CONVERT(DATETIME,COLUMNNAME,103) "103" SPECIFIES THE DATE FORMAT as dd/mm/yyyy

Replace forward slash "/ " character in JavaScript string?

First of all, that's a forward slash. And no, you can't have any in regexes unless you escape them. To escape them, put a backslash (\) in front of it.

someString.replace(/\//g, "-");

Live example

null check in jsf expression language

Use empty (it checks both nullness and emptiness) and group the nested ternary expression by parentheses (EL is in certain implementations/versions namely somewhat problematic with nested ternary expressions). Thus, so:

styleClass="#{empty obj.validationErrorMap ? ' ' :  
 (obj.validationErrorMap.contains('key') ? 'highlight_field' : 'highlight_row')}"

If still in vain (I would then check JBoss EL configs), use the "normal" EL approach:

styleClass="#{empty obj.validationErrorMap ? ' ' :  
 (obj.validationErrorMap['key'] ne null ? 'highlight_field' : 'highlight_row')}"

Update: as per the comments, the Map turns out to actually be a List (please work on your naming conventions). To check if a List contains an item the "normal" EL way, use JSTL fn:contains (although not explicitly documented, it works for List as well).

styleClass="#{empty obj.validationErrorMap ? ' ' :  
 (fn:contains(obj.validationErrorMap, 'key') ? 'highlight_field' : 'highlight_row')}"

Any way (or shortcut) to auto import the classes in IntelliJ IDEA like in Eclipse?

IntelliJ IDEA does not have an action to add imports. Rather it has the ability to do such as you type. If you enable the "Add unambiguous imports on the fly" in Settings > Editor > General > Auto Import, IntelliJ IDEA will add them as you type without the need for any shortcuts. You can also add classes and packages to exclude from auto importing to make a class you use heavily, that clashes with other classes of the same name, unambiguous.

For classes that are ambiguous (or is you prefer to have the "Add unambiguous imports on the fly" option turned off), just type the name of the class (just the name is OK, no need to fully qualify). Use code completion and select the particular class you want:

enter image description here

Notice the fully qualified names to the right. When I select the one I want and hit enter, IDEA will automatically add the import statement. This works the same if I was typing the name of a constructor. For static methods, you can even just keep typing the method you want. In the following screenshot, no "StringUtils" class is imported yet.

enter image description here

Alternatively, type the class name and then hit Alt+Enter or ?+Enter to "Show intention actions and quick-fixes" and then select the import option.

Although I've never used it, I think the Eclipse Code Formatter third party plug-in will do what you want. It lists "emulates Eclipse's imports optimizing" as a feature. See its instructions for more information. But in the end, I suspect you'll find the built in IDEA features work fine once you get use to their paradigm. In general, IDEA uses a "develop by intentions" concept. So rather than interrupting my development work to add an import statement, I just type the class I want (my intention) and IDEA automatically adds the import statement for the class for me.

Vue.js dynamic images not working

You can try the require function. like this:

<img :src="require(`@/xxx/${name}.png`)" alt class="icon" />

The model backing the 'ApplicationDbContext' context has changed since the database was created

If you delete the "[__MigrationHistory]" table from your "database > System Tables" then it will work.

How can I check if a string contains a character in C#?

here is an example what most of have done

using System;

class Program
{
    static void Main()
    {
        Test("Dot Net Perls");
        Test("dot net perls");
    }

    static void Test(string input)
    {
        Console.Write("--- ");
        Console.Write(input);
        Console.WriteLine(" ---");
        //
        // See if the string contains 'Net'
        //
        bool contains = input.Contains("Net");
        //
        // Write the result
        //
        Console.Write("Contains 'Net': ");
        Console.WriteLine(contains);
        //
        // See if the string contains 'perls' lowercase
        //
        if (input.Contains("perls"))
        {
            Console.WriteLine("Contains 'perls'");
        }
        //
        // See if the string contains 'Dot'
        //
        if (!input.Contains("Dot"))
        {
            Console.WriteLine("Doesn't Contain 'Dot'");
        }
    }
}

SQL Server 2008 Row Insert and Update timestamps

try

CREATE TABLE [dbo].[Names]
(
    [Name] [nvarchar](64) NOT NULL,
    [CreateTS] [smalldatetime] NOT NULL CONSTRAINT CreateTS_DF DEFAULT CURRENT_TIMESTAMP,
    [UpdateTS] [smalldatetime] NOT NULL

)

PS I think a smalldatetime is good enough. You may decide differently.

Can you not do this at the "moment of impact" ?

In Sql Server, this is common:

Update dbo.MyTable 
Set 

ColA = @SomeValue , 
UpdateDS = CURRENT_TIMESTAMP
Where...........

Sql Server has a "timestamp" datatype.

But it may not be what you think.

Here is a reference:

http://msdn.microsoft.com/en-us/library/ms182776(v=sql.90).aspx

Here is a little RowVersion (synonym for timestamp) example:

CREATE TABLE [dbo].[Names]
(
    [Name] [nvarchar](64) NOT NULL,
    RowVers rowversion ,
    [CreateTS] [datetime] NOT NULL CONSTRAINT CreateTS_DF DEFAULT CURRENT_TIMESTAMP,
    [UpdateTS] [datetime] NOT NULL

)


INSERT INTO dbo.Names (Name,UpdateTS)
select 'John' , CURRENT_TIMESTAMP
UNION ALL select 'Mary' , CURRENT_TIMESTAMP
UNION ALL select 'Paul' , CURRENT_TIMESTAMP

select *  ,  ConvertedRowVers = CONVERT(bigint,RowVers) from [dbo].[Names]

Update dbo.Names Set Name = Name

select *  ,  ConvertedRowVers = CONVERT(bigint,RowVers) from [dbo].[Names]

Maybe a complete working example:

DROP TABLE [dbo].[Names]
GO


CREATE TABLE [dbo].[Names]
(
    [Name] [nvarchar](64) NOT NULL,
    RowVers rowversion ,
    [CreateTS] [datetime] NOT NULL CONSTRAINT CreateTS_DF DEFAULT CURRENT_TIMESTAMP,
    [UpdateTS] [datetime] NOT NULL

)

GO

CREATE TRIGGER dbo.trgKeepUpdateDateInSync_ByeByeBye ON dbo.Names
AFTER INSERT, UPDATE
AS

BEGIN

Update dbo.Names Set UpdateTS = CURRENT_TIMESTAMP from dbo.Names myAlias , inserted triggerInsertedTable where 
triggerInsertedTable.Name = myAlias.Name

END


GO






INSERT INTO dbo.Names (Name,UpdateTS)
select 'John' , CURRENT_TIMESTAMP
UNION ALL select 'Mary' , CURRENT_TIMESTAMP
UNION ALL select 'Paul' , CURRENT_TIMESTAMP

select *  ,  ConvertedRowVers = CONVERT(bigint,RowVers) from [dbo].[Names]

Update dbo.Names Set Name = Name , UpdateTS = '03/03/2003' /* notice that even though I set it to 2003, the trigger takes over */

select *  ,  ConvertedRowVers = CONVERT(bigint,RowVers) from [dbo].[Names]

Matching on the "Name" value is probably not wise.

Try this more mainstream example with a SurrogateKey

DROP TABLE [dbo].[Names]
GO


CREATE TABLE [dbo].[Names]
(
    SurrogateKey int not null Primary Key Identity (1001,1),
    [Name] [nvarchar](64) NOT NULL,
    RowVers rowversion ,
    [CreateTS] [datetime] NOT NULL CONSTRAINT CreateTS_DF DEFAULT CURRENT_TIMESTAMP,
    [UpdateTS] [datetime] NOT NULL

)

GO

CREATE TRIGGER dbo.trgKeepUpdateDateInSync_ByeByeBye ON dbo.Names
AFTER UPDATE
AS

BEGIN

   UPDATE dbo.Names
    SET UpdateTS = CURRENT_TIMESTAMP
    From  dbo.Names myAlias
    WHERE exists ( select null from inserted triggerInsertedTable where myAlias.SurrogateKey = triggerInsertedTable.SurrogateKey)

END


GO






INSERT INTO dbo.Names (Name,UpdateTS)
select 'John' , CURRENT_TIMESTAMP
UNION ALL select 'Mary' , CURRENT_TIMESTAMP
UNION ALL select 'Paul' , CURRENT_TIMESTAMP

select *  ,  ConvertedRowVers = CONVERT(bigint,RowVers) from [dbo].[Names]

Update dbo.Names Set Name = Name , UpdateTS = '03/03/2003' /* notice that even though I set it to 2003, the trigger takes over */

select *  ,  ConvertedRowVers = CONVERT(bigint,RowVers) from [dbo].[Names]

The R %in% operator

You can use all

> all(1:6 %in% 0:36)
[1] TRUE
> all(1:60 %in% 0:36)
[1] FALSE

On a similar note, if you want to check whether any of the elements is TRUE you can use any

> any(1:6 %in% 0:36)
[1] TRUE
> any(1:60 %in% 0:36)
[1] TRUE
> any(50:60 %in% 0:36)
[1] FALSE

What is meant by immutable?

I really like the explaination from SCJP Sun Certified Programmer for Java 5 Study Guide.

To make Java more memory efficient, the JVM sets aside a special area of memory called the "String constant pool." When the compiler encounters a String literal, it checks the pool to see if an identical String already exists. If a match is found, the reference to the new literal is directed to the existing String, and no new String literal object is created.

How would you implement an LRU cache in Java?

Another thought and even a simple implementation using LinkedHashMap collection of Java.

LinkedHashMap provided method removeEldestEntry and which can be overridden in the way mentioned in example. By default implementation of this collection structure is false. If its true and size of this structure goes beyond the initial capacity than eldest or older elements will be removed.

We can have a pageno and page content in my case pageno is integer and pagecontent i have kept page number values string.

import java.util.LinkedHashMap;
import java.util.Map;

/**
 * @author Deepak Singhvi
 *
 */
public class LRUCacheUsingLinkedHashMap {


     private static int CACHE_SIZE = 3;
     public static void main(String[] args) {
        System.out.println(" Pages for consideration : 2, 1, 0, 2, 8, 2, 4,99");
        System.out.println("----------------------------------------------\n");


// accessOrder is true, so whenever any page gets changed or accessed,    // its order will change in the map, 
              LinkedHashMap<Integer,String> lruCache = new              
                 LinkedHashMap<Integer,String>(CACHE_SIZE, .75F, true) {

           private static final long serialVersionUID = 1L;

           protected boolean removeEldestEntry(Map.Entry<Integer,String>                           

                     eldest) {
                          return size() > CACHE_SIZE;
                     }

                };

  lruCache.put(2, "2");
  lruCache.put(1, "1");
  lruCache.put(0, "0");
  System.out.println(lruCache + "  , After first 3 pages in cache");
  lruCache.put(2, "2");
  System.out.println(lruCache + "  , Page 2 became the latest page in the cache");
  lruCache.put(8, "8");
  System.out.println(lruCache + "  , Adding page 8, which removes eldest element 2 ");
  lruCache.put(2, "2");
  System.out.println(lruCache+ "  , Page 2 became the latest page in the cache");
  lruCache.put(4, "4");
  System.out.println(lruCache+ "  , Adding page 4, which removes eldest element 1 ");
  lruCache.put(99, "99");
  System.out.println(lruCache + " , Adding page 99, which removes eldest element 8 ");

     }

}

Result of above code execution is as follows:

 Pages for consideration : 2, 1, 0, 2, 8, 2, 4,99
--------------------------------------------------
    {2=2, 1=1, 0=0}  , After first 3 pages in cache
    {2=2, 1=1, 0=0}  , Page 2 became the latest page in the cache
    {1=1, 0=0, 8=8}  , Adding page 8, which removes eldest element 2 
    {0=0, 8=8, 2=2}  , Page 2 became the latest page in the cache
    {8=8, 2=2, 4=4}  , Adding page 4, which removes eldest element 1 
    {2=2, 4=4, 99=99} , Adding page 99, which removes eldest element 8 

CSS: On hover show and hide different div's at the same time?

Have you tried somethig like this?

.showme{display: none;}
.showhim:hover .showme{display : block;}
.hideme{display:block;}
.showhim:hover .hideme{display:none;}

<div class="showhim">HOVER ME
  <div class="showme">hai</div>
  <div class="hideme">bye</div>
</div>

I dont know any reason why it shouldn't be possible.

React setState not updating state

Using async/await

async changeHandler(event) {
    await this.setState({ yourName: event.target.value });
    console.log(this.state.yourName);
}

How can I stop python.exe from closing immediately after I get an output?

You can't - globally, i.e. for every python program. And this is a good thing - Python is great for scripting (automating stuff), and scripts should be able to run without any user interaction at all.

However, you can always ask for input at the end of your program, effectively keeping the program alive until you press return. Use input("prompt: ") in Python 3 (or raw_input("promt: ") in Python 2). Or get used to running your programs from the command line (i.e. python mine.py), the program will exit but its output remains visible.

How to POST request using RestSharp

As of 2017 I post to a rest service and getting the results from it like that:

        var loginModel = new LoginModel();
        loginModel.DatabaseName = "TestDB";
        loginModel.UserGroupCode = "G1";
        loginModel.UserName = "test1";
        loginModel.Password = "123";

        var client = new RestClient(BaseUrl);

        var request = new RestRequest("/Connect?", Method.POST);
        request.RequestFormat = DataFormat.Json;
        request.AddBody(loginModel);

        var response = client.Execute(request);

        var obj = JObject.Parse(response.Content);

        LoginResult result = new LoginResult
        {
            Status = obj["Status"].ToString(),
            Authority = response.ResponseUri.Authority,
            SessionID = obj["SessionID"].ToString()
        };

How to create a static library with g++?

Create a .o file:

g++ -c header.cpp

add this file to a library, creating library if necessary:

ar rvs header.a header.o

use library:

g++ main.cpp header.a

How do I bind a List<CustomObject> to a WPF DataGrid?

Actually, to properly support sorting, filtering, etc. a CollectionViewSource should be used as a link between the DataGrid and the list, like this:

<Window.Resources>
  <CollectionViewSource x:Key="ItemCollectionViewSource" CollectionViewType="ListCollectionView"/>
</Window.Resources>   

The DataGrid line looks like this:

<DataGrid
  DataContext="{StaticResource ItemCollectionViewSource}"
  ItemsSource="{Binding}"
  AutoGenerateColumns="False">  

In the code behind, you link CollectionViewSource with your link.

CollectionViewSource itemCollectionViewSource;
itemCollectionViewSource = (CollectionViewSource)(FindResource("ItemCollectionViewSource"));
itemCollectionViewSource.Source = itemList;

For detailed example see my article on CoedProject: http://www.codeproject.com/Articles/683429/Guide-to-WPF-DataGrid-formatting-using-bindings

The remote server returned an error: (407) Proxy Authentication Required

Thought of writing this answer as nothing worked from above & you don't want to specify proxy location.

If you're using httpClient then consider this.

HttpClientHandler handler = new HttpClientHandler();

IWebProxy proxy = WebRequest.GetSystemWebProxy();
proxy.Credentials = CredentialCache.DefaultCredentials;
handler.Proxy = proxy;

var client = new HttpClient(handler);
// your next steps...

And if you're using HttpWebRequest:

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri + _endpoint);

IWebProxy proxy = WebRequest.GetSystemWebProxy();
proxy.Credentials = CredentialCache.DefaultCredentials;
request.Proxy = proxy;

Kind referencce: https://medium.com/@siriphonnot/the-remote-server-returned-an-error-407-proxy-authentication-required-86ae489e401b

How do I write a batch script that copies one directory to another, replaces old files?

In your batch file do this

set source=C:\Users\Habib\test
set destination=C:\Users\Habib\testdest\
xcopy %source% %destination% /y

If you want to copy the sub directories including empty directories then do:

xcopy %source% %destination% /E /y

If you only want to copy sub directories and not empty directories then use /s like:

xcopy %source% %destination% /s /y

WPF: simple TextBox data binding

Just for future needs.

In Visual Studio 2013 with .NET Framework 4.5, for a window property, try adding ElementName=window to make it work.

<Grid Name="myGrid" Height="437.274">
  <TextBox Text="{Binding Path=Name2, ElementName=window}"/>
</Grid>

How to convert java.util.Date to java.sql.Date?

java.sql.Date sqlDate = new java.sql.Date(javaDate.getTime());

Here javaDate is the instance of java.util.Date

CURL to access a page that requires a login from a different page

The web site likely uses cookies to store your session information. When you run

curl --user user:pass https://xyz.com/a  #works ok
curl https://xyz.com/b #doesn't work

curl is run twice, in two separate sessions. Thus when the second command runs, the cookies set by the 1st command are not available; it's just as if you logged in to page a in one browser session, and tried to access page b in a different one.

What you need to do is save the cookies created by the first command:

curl --user user:pass --cookie-jar ./somefile https://xyz.com/a

and then read them back in when running the second:

curl --cookie ./somefile https://xyz.com/b

Alternatively you can try downloading both files in the same command, which I think will use the same cookies.

Getting the count of unique values in a column in bash

The GNU site suggests this nice awk script, which prints both the words and their frequency.

Possible changes:

  • You can pipe through sort -nr (and reverse word and freq[word]) to see the result in descending order.
  • If you want a specific column, you can omit the for loop and simply write freq[3]++ - replace 3 with the column number.

Here goes:

 # wordfreq.awk --- print list of word frequencies

 {
     $0 = tolower($0)    # remove case distinctions
     # remove punctuation
     gsub(/[^[:alnum:]_[:blank:]]/, "", $0)
     for (i = 1; i <= NF; i++)
         freq[$i]++
 }

 END {
     for (word in freq)
         printf "%s\t%d\n", word, freq[word]
 }

Getting individual colors from a color map in matplotlib

You can do this with the code below, and the code in your question was actually very close to what you needed, all you have to do is call the cmap object you have.

import matplotlib

cmap = matplotlib.cm.get_cmap('Spectral')

rgba = cmap(0.5)
print(rgba) # (0.99807766255210428, 0.99923106502084169, 0.74602077638401709, 1.0)

For values outside of the range [0.0, 1.0] it will return the under and over colour (respectively). This, by default, is the minimum and maximum colour within the range (so 0.0 and 1.0). This default can be changed with cmap.set_under() and cmap.set_over().

For "special" numbers such as np.nan and np.inf the default is to use the 0.0 value, this can be changed using cmap.set_bad() similarly to under and over as above.

Finally it may be necessary for you to normalize your data such that it conforms to the range [0.0, 1.0]. This can be done using matplotlib.colors.Normalize simply as shown in the small example below where the arguments vmin and vmax describe what numbers should be mapped to 0.0 and 1.0 respectively.

import matplotlib

norm = matplotlib.colors.Normalize(vmin=10.0, vmax=20.0)

print(norm(15.0)) # 0.5

A logarithmic normaliser (matplotlib.colors.LogNorm) is also available for data ranges with a large range of values.

(Thanks to both Joe Kington and tcaswell for suggestions on how to improve the answer.)

How to redirect both stdout and stderr to a file

Please use command 2>file Here 2 stands for file descriptor of stderr. You can also use 1 instead of 2 so that stdout gets redirected to the 'file'

Execute an action when an item on the combobox is selected

Not an answer to the original question, but an example to the how-to-make-reusable and working custom renderers without breaking MVC :-)

// WRONG
public class DataWrapper {
   final Data data;
   final String description;
   public DataWrapper(Object data, String description) {
       this.data = data;
       this.description = description;
   }
   ....
   @Override
   public String toString() {
       return description;
   } 
}
// usage
myModel.add(new DataWrapper(data1, data1.getName());

It is wrong in a MVC environment, because it is mixing data and view: now the model doesn't contain the data but a wrapper which is introduced for view reasons. That's breaking separation of concerns and encapsulation (every class interacting with the model needs to be aware of the wrapped data).

The driving forces for breaking of rules were:

  • keep functionality of the default KeySelectionManager (which is broken by a custom renderer)
  • reuse of the wrapper class (can be applied to any data type)

As in Swing a custom renderer is the small coin designed to accomodate for custom visual representation, a default manager which can't cope is ... broken. Tweaking design just to accommodate for such a crappy default is the wrong way round, kind of upside-down. The correct is, to implement a coping manager.

While re-use is fine, doing so at the price of breaking the basic architecture is not a good bargin.

We have a problem in the presentation realm, let's solve it in the presentation realm with the elements designed to solve exactly that problem. As you might have guessed, SwingX already has such a solution :-)

In SwingX, the provider of a string representation is called StringValue, and all default renderers take such a StringValue to configure themselves:

StringValue sv = new StringValue() {
     @Override
     public String getString(Object value) {
        if (value instanceof Data) {
            return ((Data) value).getSomeProperty();
        }
        return TO_STRING.getString(value);
     }
};
DefaultListRenderer renderer = new DefaultListRenderer(sv);

As the defaultRenderer is-a StringValue (implemented to delegate to the given), a well-behaved implementation of KeySelectionManager now can delegate to the renderer to find the appropriate item:

public BetterKeySelectionManager implements KeySelectionManager {

     @Override
     public int selectionForKey(char ch, ComboBoxModel model) {

         ....
         if (getCellRenderer() instance of StringValue) {
              String text = ((StringValue) getCellRenderer()).getString(model.getElementAt(row));
              ....
         } 
     }

}

Outlined the approach because it is easily implementable even without using SwingX, simply define implement something similar and use it:

  • some provider of a string representation
  • a custom renderer which is configurable by that provider and guarantees to use it in configuring itself
  • a well-behaved keySelectionManager with queries the renderer for its string represention

All except the string provider is reusable as-is (that is exactly one implemenation of the custom renderer and the keySelectionManager). There can be general implementations of the string provider, f.i. those formatting value or using bean properties via reflection. And all without breaking basic rules :-)

How to implement the Java comparable interface?

Implement Comparable<Animal> interface in your class and provide implementation of int compareTo(Animal other) method in your class.See This Post

Replace negative values in an numpy array

Another minimalist Python solution without using numpy:

[0 if i < 0 else i for i in a]

No need to define any extra functions.

a = [1, 2, 3, -4, -5.23, 6]
[0 if i < 0 else i for i in a]

yields:

[1, 2, 3, 0, 0, 6]

Pandas: ValueError: cannot convert float NaN to integer

ValueError: cannot convert float NaN to integer

From v0.24, you actually can. Pandas introduces Nullable Integer Data Types which allows integers to coexist with NaNs.

Given a series of whole float numbers with missing data,

s = pd.Series([1.0, 2.0, np.nan, 4.0])
s

0    1.0
1    2.0
2    NaN
3    4.0
dtype: float64

s.dtype
# dtype('float64')

You can convert it to a nullable int type (choose from one of Int16, Int32, or Int64) with,

s2 = s.astype('Int32') # note the 'I' is uppercase
s2

0      1
1      2
2    NaN
3      4
dtype: Int32

s2.dtype
# Int32Dtype()

Your column needs to have whole numbers for the cast to happen. Anything else will raise a TypeError:

s = pd.Series([1.1, 2.0, np.nan, 4.0])

s.astype('Int32')
# TypeError: cannot safely cast non-equivalent float64 to int32

What does 'COLLATE SQL_Latin1_General_CP1_CI_AS' do?

The CP1 means 'Code Page 1' - technically this translates to code page 1252

Finding three elements in an array whose sum is closest to a given number

Program to get those three elements. I have just sorted the array/list first and them updated minCloseness based upon each triplet.

public int[] threeSumClosest(ArrayList<Integer> A, int B) {
    Collections.sort(A);
    int ansSum = 0;
    int ans[] = new int[3];
    int minCloseness = Integer.MAX_VALUE;
    for (int i = 0; i < A.size()-2; i++){
        int j = i+1;
        int k = A.size()-1;
        while (j < k){
            int sum = A.get(i) + A.get(j) + A.get(k);
            if (sum < B){
                j++;
            }else{
                k--;
            }
            if (minCloseness >  Math.abs(sum - B)){
                minCloseness = Math.abs(sum - B);
                ans[0] = A.get(i); ans[1] = A.get(j); ans[2] = A.get(k);
            }
        }
    }
    return ans;
}

PHP: cannot declare class because the name is already in use

I had this problem before and to fix this, Just make sure :

  1. You did not create an instance of this class before
  2. If you call this from a class method, make sure the __destruct is set on the class you called from.

My problem (before) :
I had class : Core, Router, Permissions and Render Core include's the Router class, Router then calls Permissions class, then Router __destruct calls the Render class and the error "Cannot declare class because the name is already in use" appeared.

Solution :
I added __destruct on Permission class and the __destruct was empty and it's fixed...

Can I have a video with transparent background using HTML5 video tag?

Yes, this sort of thing is possible without Flash:

However, only very modern browsers supports HTML5 videos, and this should be your consideration when deploying in HTML 5, and you should provide a fallback (probably Flash or just omit the transparency).

Passing properties by reference in C#

The accepted answer is good if that function is in your code and you can modify it. But sometimes you have to use an object and a function from some external library and you can't change the property and function definition. Then you can just use a temporary variable.

var phone = Client.WorkPhone;
GetString(input, ref phone);
Client.WorkPhone = phone;

Android get Current UTC time

System.currentTimeMillis() does give you the number of milliseconds since January 1, 1970 00:00:00 UTC. The reason you see local times might be because you convert a Date instance to a string before using it. You can use DateFormats to convert Dates to Strings in any timezone:

DateFormat df = DateFormat.getTimeInstance();
df.setTimeZone(TimeZone.getTimeZone("gmt"));
String gmtTime = df.format(new Date());

Also see this related question.

Recursively look for files with a specific extension

find $directory -type f -name "*.in"

is a bit shorter than that whole thing (and safer - deals with whitespace in filenames and directory names).

Your script is probably failing for entries that don't have a . in their name, making $extension empty.

How to convert dd/mm/yyyy string into JavaScript Date object?

You can use toLocaleString(). This is a javascript method.

_x000D_
_x000D_
var event = new Date("01/02/1993");_x000D_
_x000D_
var options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };_x000D_
_x000D_
console.log(event.toLocaleString('en', options));_x000D_
_x000D_
// expected output: "Saturday, January 2, 1993"
_x000D_
_x000D_
_x000D_

Almost all formats supported. Have look on this link for more details.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleString

Getting all file names from a folder using C#

I would recommend you google 'Read objects in folder'. You might need to create a reader and a list and let the reader read all the object names in the folder and add them to the list in n loops.

How do I write a compareTo method which compares objects?

if (s.compareTo(t) > 0) will compare string s to string t and return the int value you want.

    public int Compare(Object obj) // creating a method to compare {   
        Student s = (Student) obj; //creating a student object

        // compare last names
        return  this.lastName.compareTo(s.getLastName());    
    }

Now just test for a positive negative return from the method as you would have normally.

Cheers

'NOT LIKE' in an SQL query

You have missed out the field name id in the second NOT LIKE. Try:

SELECT * FROM transactions WHERE id NOT LIKE '1%' AND id NOT LIKE '2%'

The AND in the where clause joins 2 full condition expressions such as id NOT LIKE '1%' and can't be used to list multiple values that the id is 'not like'.

Python: slicing a multi-dimensional array

If you use numpy, this is easy:

slice = arr[:2,:2]

or if you want the 0's,

slice = arr[0:2,0:2]

You'll get the same result.

*note that slice is actually the name of a builtin-type. Generally, I would advise giving your object a different "name".


Another way, if you're working with lists of lists*:

slice = [arr[i][0:2] for i in range(0,2)]

(Note that the 0's here are unnecessary: [arr[i][:2] for i in range(2)] would also work.).

What I did here is that I take each desired row 1 at a time (arr[i]). I then slice the columns I want out of that row and add it to the list that I'm building.

If you naively try: arr[0:2] You get the first 2 rows which if you then slice again arr[0:2][0:2], you're just slicing the first two rows over again.

*This actually works for numpy arrays too, but it will be slow compared to the "native" solution I posted above.

Writing BMP image in pure c/c++ without other libraries

If you get strange colors switches in the middle of your image using the above C++ function. Be sure to open the outstream in binary mode: imgFile.open(filename, std::ios_base::out | std::ios_base::binary);
Otherwise windows inserts unwanted characters in the middle of your file! (been banging my head on this issue for hours)

See related question here: Why does ofstream insert a 0x0D byte before 0x0A?

How to print exact sql query in zend framework ?

$statement = $this->sql->getSqlStringForSqlObject( HERE GOES Zend\Db\Sql\SelectSQL object );

echo "SQL statement: $statement";

Example:

$select = $this->sql->select();
...
$select->from(array( 'u' => 'users' ));
$select->join(...
$select->group('u.id');
...
$statement = $this->sql->getSqlStringForSqlObject($select);
echo $statement;

How to Load Ajax in Wordpress

As per your request I have put this in an answer for you.

As Hieu Nguyen suggested in his answer, you can use the ajaxurl javascript variable to reference the admin-ajax.php file. However this variable is not declared on the frontend. It is simple to declare this on the front end, by putting the following in the header.php of your theme.

<script type="text/javascript">
    var ajaxurl = "<?php echo admin_url('admin-ajax.php'); ?>";
</script>

As is described in the Wordpress AJAX documentation, you have two different hooks - wp_ajax_(action), and wp_ajax_nopriv_(action). The difference between these is:

  • wp_ajax_(action): This is fired if the ajax call is made from inside the admin panel.
  • wp_ajax_nopriv_(action): This is fired if the ajax call is made from the front end of the website.

Everything else is described in the documentation linked above. Happy coding!

P.S. Here is an example that should work. (I have not tested)

Front end:

<script type="text/javascript">
    jQuery.ajax({
        url: ajaxurl,
        data: {
            action: 'my_action_name'
        },
        type: 'GET'
    });
</script>

Back end:

<?php
    function my_ajax_callback_function() {
        // Implement ajax function here
    }
    add_action( 'wp_ajax_my_action_name', 'my_ajax_callback_function' );    // If called from admin panel
    add_action( 'wp_ajax_nopriv_my_action_name', 'my_ajax_callback_function' );    // If called from front end
?>

UPDATE Even though this is an old answer, it seems to keep getting thumbs up from people - which is great! I think this may be of use to some people.

WordPress has a function wp_localize_script. This function takes an array of data as the third parameter, intended to be translations, like the following:

var translation = {
    success: "Success!",
    failure: "Failure!",
    error: "Error!",
    ...
};

So this simply loads an object into the HTML head tag. This can be utilized in the following way:

Backend:

wp_localize_script( 'FrontEndAjax', 'ajax', array(
    'url' => admin_url( 'admin-ajax.php' )
) );

The advantage of this method is that it may be used in both themes AND plugins, as you are not hard-coding the ajax URL variable into the theme.

On the front end, the URL is now accessible via ajax.url, rather than simply ajaxurl in the previous examples.

If conditions in a Makefile, inside a target

There are several problems here, so I'll start with my usual high-level advice: Start small and simple, add complexity a little at a time, test at every step, and never add to code that doesn't work. (I really ought to have that hotkeyed.)

You're mixing Make syntax and shell syntax in a way that is just dizzying. You should never have let it get this big without testing. Let's start from the outside and work inward.

UNAME := $(shell uname -m)

all:
    $(info Checking if custom header is needed)
    ifeq ($(UNAME), x86_64)
    ... do some things to build unistd_32.h
    endif

    @make -C $(KDIR) M=$(PWD) modules

So you want unistd_32.h built (maybe) before you invoke the second make, you can make it a prerequisite. And since you want that only in a certain case, you can put it in a conditional:

ifeq ($(UNAME), x86_64)
all: unistd_32.h
endif

all:
    @make -C $(KDIR) M=$(PWD) modules

unistd_32.h:
    ... do some things to build unistd_32.h

Now for building unistd_32.h:

F1_EXISTS=$(shell [ -e /usr/include/asm/unistd_32.h ] && echo 1 || echo 0 )
ifeq ($(F1_EXISTS), 1)
    $(info Copying custom header)
    $(shell sed -e 's/__NR_/__NR32_/g' /usr/include/asm/unistd_32.h > unistd_32.h)
else    
    F2_EXISTS=$(shell [[ -e /usr/include/asm-i386/unistd.h ]] && echo 1 || echo 0 )
    ifeq ($(F2_EXISTS), 1)
        $(info Copying custom header)
        $(shell sed -e 's/__NR_/__NR32_/g' /usr/include/asm-i386/unistd.h > unistd_32.h)
    else
        $(error asm/unistd_32.h and asm-386/unistd.h does not exist)
    endif
endif

You are trying to build unistd.h from unistd_32.h; the only trick is that unistd_32.h could be in either of two places. The simplest way to clean this up is to use a vpath directive:

vpath unistd.h /usr/include/asm /usr/include/asm-i386

unistd_32.h: unistd.h
    sed -e 's/__NR_/__NR32_/g' $< > $@

IsNumeric function in c#

It is worth mentioning that one can check the characters in the string against Unicode categories - numbers, uppercase, lowercase, currencies and more. Here are two examples checking for numbers in a string using Linq:

var containsNumbers = s.Any(Char.IsNumber);
var isNumber = s.All(Char.IsNumber);

For clarity, the syntax above is a shorter version of:

var containsNumbers = s.Any(c=>Char.IsNumber(c));
var isNumber = s.All(c=>Char.IsNumber(c));

Link to unicode categories on MSDN:

UnicodeCategory Enumeration

Difference between abstraction and encapsulation?

A mechanism that prevents the data of a particular objects safe from intentional or accidental misuse by external functions is called "data Encapsulation"

The act of representing essential features without including the background details or explanations is known as abstraction

Create line after text with css

Here is how I do this: http://jsfiddle.net/Zz7Wq/2/

I use a background instead of after and use my H1 or H2 to cover the background. Not quite your method above but does work well for me.

CSS

.title-box { background: #fff url('images/bar-orange.jpg') repeat-x left; text-align: left; margin-bottom: 20px;}
.title-box h1 { color: #000; background-color: #fff; display: inline; padding: 0 50px 0 50px; }

HTML

<div class="title-box"><h1>Title can go here</h1></div>
<div class="title-box"><h1>Title can go here this one is really really long</h1></div>

Java Class.cast() vs. cast operator

Generally the cast operator is preferred to the Class#cast method as it's more concise and can be analyzed by the compiler to spit out blatant issues with the code.

Class#cast takes responsibility for type checking at run-time rather than during compilation.

There are certainly use-cases for Class#cast, particularly when it comes to reflective operations.

Since lambda's came to java I personally like using Class#cast with the collections/stream API if I'm working with abstract types, for example.

Dog findMyDog(String name, Breed breed) {
    return lostAnimals.stream()
                      .filter(Dog.class::isInstance)
                      .map(Dog.class::cast)
                      .filter(dog -> dog.getName().equalsIgnoreCase(name))
                      .filter(dog -> dog.getBreed() == breed)
                      .findFirst()
                      .orElse(null);
}

NULL vs nullptr (Why was it replaced?)

You can find a good explanation of why it was replaced by reading A name for the null pointer: nullptr, to quote the paper:

This problem falls into the following categories:

  • Improve support for library building, by providing a way for users to write less ambiguous code, so that over time library writers will not need to worry about overloading on integral and pointer types.

  • Improve support for generic programming, by making it easier to express both integer 0 and nullptr unambiguously.

  • Make C++ easier to teach and learn.

How do I get cURL to not show the progress bar?

Since curl 7.67.0 (2019-11-06) there is --no-progress-meter, which does exactly this, and nothing else. From the man page:

   --no-progress-meter
         Option to switch off the progress meter output without muting or
         otherwise affecting warning and informational messages like  -s,
         --silent does.

         Note  that  this  is the negated option name documented. You can
         thus use --progress-meter to enable the progress meter again.

         See also -v, --verbose and -s, --silent. Added in 7.67.0.

It's available in Ubuntu =20.04 and Debian =11 (Bullseye).

For a bit of history on curl's verbosity options, you can read Daniel Stenberg's blog post.

Failed to fetch URL https://dl-ssl.google.com/android/repository/addons_list-1.xml, reason: Connection to https://dl-ssl.google.com refused

Follow the following steps if you are using proxy server:

  1. Open Eclipse
  2. Window >> Android SDK Manager >> Option
  3. Input your proxy server and port.

Hope this helps.

How can I view the source code for a function?

In RStudio, there are (at least) 3 ways:

  1. Press the F2 key while cursor is on any function.
  2. Click on the function name while holding Ctrl or Command
  3. View(function_name) (as stated above)

A new pane will open with the source code. If you reach .Primitive or .C you'll need another method, sorry.

Unable to find a @SpringBootConfiguration when doing a JpaTest

I had the same issue and I solved by adding an empty class annotated with SpringBootApplication in the root package of the folder src/test/java

package org.enricogiurin.core;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class CoreTestConfiguration {}

How do I check whether a checkbox is checked in jQuery?

There are many ways to check if a checkbox is checked or not:

Way to check using jQuery

if (elem.checked)
if ($(elem).prop("checked"))
if ($(elem).is(":checked"))
if ($(elem).attr('checked'))

Check example or also document:

Python: Adding element to list while iterating

You can do this.

bonus_rows = []
for a in myarr:
  if somecond(a):
      bonus_rows.append(newObj())
myarr.extend( bonus_rows )

Name attribute in @Entity and @Table

@Entity(name = "someThing") => this name will be used to identify the domain ..this name will only be identified by hql queries ..ie ..name of the domain object

@Table(name = "someThing") => this name will be used to which table referred by domain object..ie ..name of the table

How to set JAVA_HOME for multiple Tomcat instances?

One thing that you could do would be to modify the catalina.sh (Unix based) or the catalina.bat (windows based).

Within each of the scripts you can set certain variables which only processes created under the shell will inherit. So for catalina.sh, use the following line:

export JAVA_HOME="intented java home"

And for windows use

set JAVA_HOME="intented java home"

Setting Windows PowerShell environment variables

If, some time during a PowerShell session, you need to append to the PATH environment variable temporarily, you can do it this way:

$env:Path += ";C:\Program Files\GnuWin32\bin"

Conditionally ignoring tests in JUnit 4

The JUnit way is to do this at run-time is org.junit.Assume.

 @Before
 public void beforeMethod() {
     org.junit.Assume.assumeTrue(someCondition());
     // rest of setup.
 }

You can do it in a @Before method or in the test itself, but not in an @After method. If you do it in the test itself, your @Before method will get run. You can also do it within @BeforeClass to prevent class initialization.

An assumption failure causes the test to be ignored.

Edit: To compare with the @RunIf annotation from junit-ext, their sample code would look like this:

@Test
public void calculateTotalSalary() {
    assumeThat(Database.connect(), is(notNull()));
    //test code below.
}

Not to mention that it is much easier to capture and use the connection from the Database.connect() method this way.

TypeScript: casting HTMLElement

Could be solved in the declaration file (lib.d.ts) if TypeScript would define HTMLCollection instead of NodeList as a return type.

DOM4 also specifies this as the correct return type, but older DOM specifications are less clear.

See also http://typescript.codeplex.com/workitem/252

Compress files while reading data from STDIN

Yes, gzip will let you do this. If you simply run gzip > foo.gz, it will compress STDIN to the file foo.gz. You can also pipe data into it, like some_command | gzip > foo.gz.

How to convert String into Hashmap in java

@Test
public void testToStringToMap() {
    Map<String,String> expected = new HashMap<>();
    expected.put("first_name", "naresh");
    expected.put("last_name", "kumar");
    expected.put("gender", "male");
    String mapString = expected.toString();
    Map<String, String> actual = Arrays.stream(mapString.replace("{", "").replace("}", "").split(","))
            .map(arrayData-> arrayData.split("="))
            .collect(Collectors.toMap(d-> ((String)d[0]).trim(), d-> (String)d[1]));

    expected.entrySet().stream().forEach(e->assertTrue(actual.get(e.getKey()).equals(e.getValue())));
}

High Quality Image Scaling Library

You could try the magic kernel. It produces less pixelation artifacts than bicubic resample when upscaling and it also gives very good results when downscaling. The source code is available in c# from the web site.

Get index of element as child relative to parent

Delegate and Live are easy to use but if you won't have any more li:s added dynamically you could use event delagation with normal bind/click as well. There should be some performance gain using this method since the DOM won't have to be monitored for new matching elements. Haven't got any actual numbers but it makes sense :)

$("#wizard").click(function (e) {
    var source = $(e.target);
    if(source.is("li")){
        // alert index of li relative to ul parent
        alert(source.index());
    }
});

You could test it at jsFiddle: http://jsfiddle.net/jimmysv/4Sfdh/1/

Javascript/jQuery detect if input is focused

With pure javascript:

this === document.activeElement // where 'this' is a dom object

or with jquery's :focus pseudo selector.

$(this).is(':focus');

Calling variable defined inside one function from another function

Everything in python is considered as object so functions are also objects. So you can use this method as well.

def fun1():
    fun1.var = 100
    print(fun1.var)

def fun2():
    print(fun1.var)

fun1()
fun2()

print(fun1.var)

android - setting LayoutParams programmatically

  LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(
                   /*width*/ ViewGroup.LayoutParams.MATCH_PARENT,
                   /*height*/ ViewGroup.LayoutParams.MATCH_PARENT,
                   /*weight*/ 1.0f
            );
            YOUR_VIEW.setLayoutParams(param);

How to add line breaks to an HTML textarea?

I have a textarea with id is #infoartist follow:

<textarea id="infoartist" ng-show="dForm" style="width: 100%;" placeholder="Tell your contacts and collectors about yourself."></textarea>

In javascript code, i'll get value of textarea and replace escaping new line (\n\r) by <br /> tag, such as:

var text = document.getElementById("infoartist").value;
text = text.replace(/\r?\n/g, '<br />');

So if you are using jquery (like me):

var text = $("#infoartist").val();
text = text.replace(/\r?\n/g, '<br />');

Hope it helped you. :-)

Node.js - How to send data from html to express

Using http.createServer is very low-level and really not useful for creating web applications as-is.

A good framework to use on top of it is Express, and I would seriously suggest using it. You can install it using npm install express.

When you have, you can create a basic application to handle your form:

var express = require('express');
var bodyParser = require('body-parser');
var app     = express();

//Note that in version 4 of express, express.bodyParser() was
//deprecated in favor of a separate 'body-parser' module.
app.use(bodyParser.urlencoded({ extended: true })); 

//app.use(express.bodyParser());

app.post('/myaction', function(req, res) {
  res.send('You sent the name "' + req.body.name + '".');
});

app.listen(8080, function() {
  console.log('Server running at http://127.0.0.1:8080/');
});

You can make your form point to it using:

<form action="http://127.0.0.1:8080/myaction" method="post">

The reason you can't run Node on port 80 is because there's already a process running on that port (which is serving your index.html). You could use Express to also serve static content, like index.html, using the express.static middleware.

Insert a new row into DataTable

// get the data table
DataTable dt = ...;

// generate the data you want to insert
DataRow toInsert = dt.NewRow();

// insert in the desired place
dt.Rows.InsertAt(toInsert, index);

javascript scroll event for iPhone/iPad?

The iPhoneOS does capture onscroll events, except not the way you may expect.

One-finger panning doesn’t generate any events until the user stops panning—an onscroll event is generated when the page stops moving and redraws—as shown in Figure 6-1.

Similarly, scroll with 2 fingers fires onscroll only after you've stopped scrolling.

The usual way of installing the handler works e.g.

window.addEventListener('scroll', function() { alert("Scrolled"); });
// or
$(window).scroll(function() { alert("Scrolled"); });
// or
window.onscroll = function() { alert("Scrolled"); };
// etc 

(See also https://developer.apple.com/library/content/documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html)

What is IPV6 for localhost and 0.0.0.0?

The ipv6 localhost is ::1. The unspecified address is ::. This is defined in RFC 4291 section 2.5.

How to style a select tag's option element?

Since version 49+, Chrome has supported styling <option> elements with font-weight. Source: https://code.google.com/p/chromium/issues/detail?id=44917#c22

New SELECT Popup: font-weight style should be applied.

This CL removes themeChromiumSkia.css. |!important| in it prevented to apply font-weight. Now html.css has |font-weight:normal|, and |!important| should be unnecessary.

There was a Chrome stylesheet, themeChromiumSkia.css, that used font-weight: normal !important; in it all this time. It was introduced to the stable Chrome channel in version 49.0.

How do I run Python code from Sublime Text 2?

In python v3.x you should go to : Tools->Build System->New Build System.

Then, it pop up the untitled.sublime-build window in sublime text editor.Enter setting as:

{

    "cmd": ["path_to_the_python.exe","-u", "$file"],
    "file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
    "selector": "source.python"
}

To see the path, Type following in terminal as:

python
>>> import sys
>>>print(sys.executable)

You can make more than one Build System but it should default save inside Packages of Sublime text with .sublime-build extension.

Then, select the new Build System and press cltr+b or other based on your os.

How to fix: "No suitable driver found for jdbc:mysql://localhost/dbname" error when using pools?

You can stick the jar in the path of run time of jboss like this:

C:\User\user\workspace\jboss-as-web-7.0.0.Final\standalone\deployments\MYapplicationEAR.ear\test.war\WEB-INF\lib ca marche 100%

How can I limit ngFor repeat to some number of items in Angular?

html

<table class="table border">
    <thead>
        <tr>
            <ng-container *ngFor="let column of columns; let i = index">
                <th>{{ column }}</th>
            </ng-container>
        </tr>
    </thead>
    <tbody>
        <tr *ngFor="let row of groups;let i = index">
            <td>{{row.name}}</td>
            <td>{{row.items}}</td>
            <td >
                <span class="status" *ngFor="let item of row.Status | slice:0:2;let j = index">
                    {{item.name}}
                   </span><span *ngIf = "i < 2" class="dots" (mouseenter) ="onHover(i)" (mouseleave) ="onHover(-1)">.....</span> <span [hidden] ="test" *ngIf = "i == hoverIndex" class="hover-details"><span  *ngFor="let item of row.Status;let j = index">
                    {{item.name}}
                   </span></span>
           </td>

        </tr>
  </tbody>
</table>

<p *ngFor="let group of usersg"><input type="checkbox" [checked]="isChecked(group.id)" value="{{group.id}}" />{{group.name}}</p>

<p><select [(ngModel)]="usersr_selected.id">
   <option *ngFor="let role of usersr" value="{{role.id}}">{{role.name}}</option> 
</select></p>

typescript

import { Component, OnInit } from '@angular/core';
import { CommonserviceService } from './../utilities/services/commonservice.service';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
@Component({
  selector: 'app-home',
  templateUrl: './home.component.html',
  styleUrls: ['./home.component.css']
})
export class HomeComponent implements OnInit {
  getListData: any;
 dataGroup: FormGroup;
 selectedGroups: string[];
    submitted = false;
    usersg_checked:any;
    usersr_selected:any;
    dotsh:any;
    hoverIndex:number = -1;
    groups:any;
    test:any;
 constructor(private formBuilder: FormBuilder) {


     }
     onHover(i:number){
 this.hoverIndex = i;
}
     columns = ["name", "Items","status"];

public usersr = [{
    "id": 1,
    "name": "test1"

}, {
    "id": 2,
    "name": "test2",

}];


  ngOnInit() {
      this.test = false;
      this.groups=[{
        "id": 1,
        "name": "pencils",
        "items": "red pencil",
        "Status": [{
            "id": 1,
            "name": "green"
        }, {
            "id": 2,
            "name": "red"
        }, {
            "id": 3,
            "name": "yellow"
        }],
        "loc": [{
            "id": 1,
            "name": "loc 1"
        }, {
            "id": 2,
            "name": "loc 2"
        }, {
            "id": 3,
            "name": "loc 3"
        }]
    },
    {
        "id": 2,
        "name": "rubbers",
        "items": "big rubber",
        "Status": [{
            "id": 1,
            "name": "green"
        }, {
            "id": 2,
            "name": "red"
        }],
        "loc": [{
            "id": 1,
            "name": "loc 2"
        }, {
            "id": 2,
            "name": "loc 3"
        }]
    },
    {
        "id": 3,
        "name": "rubbers1",
        "items": "big rubber1",
        "Status": [{
            "id": 1,
            "name": "green"
        }],
        "loc": [{
            "id": 1,
            "name": "loc 2"
        }, {
            "id": 2,
            "name": "loc 3"
        }]
    }

];

      this.dotsh = false;

      console.log(this.groups.length);

this.usersg_checked = [{
    "id": 1,
    "name": "test1"

}, {
    "id": 2,
    "name": "test2",

}];

 this.usersr_selected = {"id":1,"name":"test2"};;

this.selectedGroups = [];
this.dataGroup = this.formBuilder.group({
            email: ['', Validators.required]
});
  }

  isChecked(id) {
   console.log(this.usersg_checked);
  return this.usersg_checked.some(item => item.id === id);
}
 get f() { return this.dataGroup.controls; }
onCheckChange(event) {
  if (event.target.checked) {
 this.selectedGroups.push(event.target.value);
} else {
 const index = this.selectedGroups.findIndex(item => item === event.target.value);
 if (index !== -1) {
  this.selectedGroups.splice(index, 1);
}
}
}

   getFormData(value){
      this.submitted = true;

        // stop here if form is invalid
        if (this.dataGroup.invalid) {
            return;
        }
      value['groups'] = this.selectedGroups;
      console.log(value);
  }


}

css

.status{
    border: 1px solid;
    border-radius: 4px;
    padding: 0px 10px;
    margin-right: 10px;
}
.hover-details{
    position: absolute;


    border: 1px solid;
    padding: 10px;
    width: 164px;
    text-align: left;
    border-radius: 4px;
}
.dots{
    position:relative;
}

ADB not responding. You can wait more,or kill "adb.exe" process manually and click 'Restart'

1.if your phone system is over 4.2.2 , there will be enter image description here

2.disconnect the USB and try again or restart your phone

3.After after all try , it didn't work. It may be a shortage power supply so try other usb interface on your computer.

I solved the problem doing the first step . anyway have try.

Clicking at coordinates without identifying element

In Selenium Java, you can try it using Javascript:

_x000D_
_x000D_
WebDriver driver = new ChromeDriver();_x000D_
_x000D_
if (driver instanceof JavascriptExecutor) {_x000D_
 ((JavascriptExecutor) driver).executeScript("el = document.elementFromPoint(x-cordinate, y-cordinate); el.click();");_x000D_
}
_x000D_
_x000D_
_x000D_

If a DOM Element is removed, are its listeners also removed from memory?

regarding jQuery:

the .remove() method takes elements out of the DOM. Use .remove() when you want to remove the element itself, as well as everything inside it. In addition to the elements themselves, all bound events and jQuery data associated with the elements are removed. To remove the elements without removing data and events, use .detach() instead.

Reference: http://api.jquery.com/remove/

jQuery v1.8.2 .remove() source code:

remove: function( selector, keepData ) {
    var elem,
        i = 0;

    for ( ; (elem = this[i]) != null; i++ ) {
        if ( !selector || jQuery.filter( selector, [ elem ] ).length ) {
            if ( !keepData && elem.nodeType === 1 ) {
                jQuery.cleanData( elem.getElementsByTagName("*") );
                jQuery.cleanData( [ elem ] );
            }

            if ( elem.parentNode ) {
                elem.parentNode.removeChild( elem );
            }
        }
    }

    return this;
}

apparently jQuery uses node.removeChild()

According to this : https://developer.mozilla.org/en-US/docs/DOM/Node.removeChild ,

The removed child node still exists in memory, but is no longer part of the DOM. You may reuse the removed node later in your code, via the oldChild object reference.

ie event listeners might get removed, but node still exists in memory.